OPERATORS MANUAL
Contents
1. 17 Continue to monitor brake cooling temperatures to ensure brakes are not dragging or a malfunction exists in the cooling circuit 6 162. Limitations 3 2 Blank 175 777 1 1 Aug 2012 SECTION 4 Normal Operations Contents Maximum Allowable Weights 4 sers tate 4 2 Weight amp Dimensions 4 Transitioning With A Load 4 3 Before Operations ona 4 2 Unloading Stationary or Moving 4 3 OPTIONS ns 4 2 After Operations 4 3 DESCRIPTION The MHT normal operating procedures mirror This section provides the vehicle operator with step by step procedures used to operate the MHT system only See the 777 G the established CAT format of operations The procedures separated into before Operations operations and after operations A operators manual for specific tractor pocket size checklist of all MHT procedures is operations and system details contained in the Appendix for use in the vehicle cab WEIGHT AND DIMENSIONS e1 64nm 19 5 9n pa MHT175 CAT777 G Empty Weight 231 517 LBS 105 015 KG 4 1 MHT175 CAT777 G 1 1 Aug 2012 SECTION 4 Normal Operations BEFORE OPERATIONS These procedures are used to perform a walk around inspection of the MHT system before use or beginning of the shift This inspection is in addition to and does not replace the CAT 777 G inspection requirements 1 Vehicle Engine AS REQUIRED 2 Chocks INSTALLED AS REQUIRED 3 Transmission Control Lever
3. P Park 4 Hoist Control Lever HOLD 5 Hitch Ball Retaining Plate CHECKED FOR DAMAGE AND SECURITY Lift ball skirt and check for loose or sheared bolt heads 6 Turn Limit Indicator CHECKED FOR SECURITY AND DAMAGE 7 Upper Deck Assembly CHECKED FOR DAMAGE AND SECURITY 8 Upper Hitch and Hydraulic Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS 9 Upper Gooseneck and CHECKED FOR DAMAGE SECURITY AND LEAKS 10 Chassis Hydraulic Tank SERVICED 11 LH Hitch Deck and Fender CHECKED AND SECURED 12 Gooseneck Access Panels CHECKED AND SECURED 4 2 13 LH Door Hydraulic Cylinders Structure Cavity Drain Holes and Lights CHECKED FOR DAMAGE SECURITY AND LEAKS 14 Trailer Axle Frame Assembly Axle Assembly Manifolds and Accumulators CHECK FOR DAMAGE SECURITY AND LEAKS 15 Tail Light Assemblies CHECKED FOR DAMAGE 16 RH Door Hydraulic Cylinders Structure Cavity Drain Holes Lights CHECKED FOR DAMAGE SECURITY AND LEAKS 17 RH Hitch Deck and Fender CHECKED FOR DAMAGE AND SECURED 18 If Equipped RH Consolidated Service Center LEVELS CHECKED OPERATIONS Use these procedures to safely operate the standard and optional systems installed on the MHT175 CAT777 G LOADING 1 Hoist Control Lever LOWER Doors fully closed then immediately to HOLD If doors do not fully close and the body position light is on
4. chassis rails and upper deck horse collar The turn limit indicator is designed to contact the gooseneck stops and provide visible indication of the maximum trailer rotation left or right MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description Electronic In Cab Mounted Warning Box The system consists of a roller switch mounted on the hitch retaining plate and a warning box located the cab The roller switch is activated by flags mounted on the underside of the ball skirt disc When the trailer rotates about 85 either side of center trail the flag will activate the switch in turn providing power to activate the amber warning light and audio horn on the warning box The system receives 24 VDC switched power from the tractor MHT BRAKE SYSTEM The MHT rear axle braking 15 integrated with the existing CAT 777G tractor service secondary and parking brakes systems MEGA has added an additional scavenge pump one additional accumulator trailer mounted a moditied brake valve and several restrictors within the brake system to acguire a fully functional cooling and activation system 2 4 The trailer brake 15 accomplished with existing in cab service brake pedal secondary brake control pedals as well as the gear shift lever for parking brake Deceleration of the vehicle from running operating speed 15 typically accomplished by using the retarder Always consider road conditions wet i
5. cycle the hoist control lever to LOWER doors closed then immediately back to HOLD Ensure the body position warning light is off 2 Hoist Control Lever HOLD 3 Body Position Warning Light OFF MHT175 CAT777 G 1 1 Aug 2012 SECTION 4 Normal Operations 4 Positioned MHT for loading within the load markers 5 Transmission Control Lever P Park 6 On Load As Required Once on load is complete 7 Transmission Control Lever As Required 8 Move away from the loading area TRANSITING WITH A LOAD 1 While driving periodically scan side view mirrors for evidence of doors opening 2 Body Position Warning Light OFF UNLOADING Stationary 1 Position MHT for unloading 2 Brakes As Required 3 Hoist Control Lever AS DESIRED TO DUMP LOAD Once load is dumped 4 Hoist Control Lever LOWER Doors fully closed then immediately to HOLD If doors do not fully close and the body position light is on cycle the hoist control lever to LOWER doors closed then immediately back to HOLD Ensure the body position warning light 15 off 5 Hoist Control Lever HOLD 4 3 UNLOADING Moving It is highly recommended a dozer be available to keep dump entry and exit paths level during stockpile operations 1 When entering stockpile to dump find level area that will not require any turning once the dump has started The truck should be locked in first or second gear Det
6. AT777 G 1 1 Aug 2012 SECTION 4 Normal Operations 16 RH Door Hydraulic Cylinders Structure 6 Confirm with maintenance and perform Cavity Drain Holes and Lights actual inspection of the chassis systems to CHECKED FOR DAMAGE SECURITY ensure the following brake and control AND LEAKS system configuration exist 17 RH Hitch Deck and Fender CHECKED FOR DAMAGE AND SECURED Brake Cooling Manifold RT Side 18 If Equipped RH Consolidated Service a A jumper hose connects the brake Center LEVELS CHECKED cooling port to the brake return port 32 fitting DECOUPLED OPERATIONS The procedures are used to operate the chassis Brake Activation Manifold LT Side with the trailer removed decoupled Decoupled operations can only be attempted b Grease port trailer supply port 1s when the brake and associated control capped off 8 fitting systems are reconfigured for decoupled operations c Brake accumulator trailer supply port Do not operate the chassis decoupled from d Trailer service return port 15 capped the trailer unless the brake and associated off 16 fitting control systems are configured properly Failure to ensure proper brake system e Trailer E Brake Parking brake retract configuration exists may result in inoperative supply port is capped off 10 fitting service parking and secondary brake systems Operating the chassis with inoperative brake f Trailer service brake signal in and out systems may re
7. KED FOR DAMAGE SECURITY AND LEAKS 17 RH Hitch Deck and Fender CHECKED FOR DAMAGE AND SECURED 18 If Equipped RH Consolidated Service Center Levels Checked Use these procedures to safely operate the standard and optional systems installed on the MHT175 OPERATIONS CAT777 G 6 5 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 LOADING 1 Hoist Control Lever LOWER Doors fully closed then immediately HOLD If doors do not fully close and the body position light 1s on cycle the hoist control lever to LOWER doors closed then immediately back to HOLD Ensure the body position warning light is off 2 Hoist Control Lever HOLD 4 Positioned MHT for loading within the load markers 5 Transmission Control Lever P Park 6 On Load As Required Once on load 15 complete 7 Transmission Control Lever As Required 3 Body Position Warning Light OFF 6 Move away from the loading area 6 6 MHT175 CAT777 G 1 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug2012 TRANSITING WITH A LOAD 1 While driving periodically scan side view mirrors tor evidence of doors opening 2 Body Position Wa
8. ONS These procedures are used to perform a walk around inspection after using MHT175 CAT777 G system This inspection is in addition to and does not replace the CAT 777 G inspection requirements 1 Transmission Control Lever P Park 2 Vehicle Engine AS REQUIRED 3 Hoist Control Lever HOLD 4 Turn Limit Indicator CHECKED FOR DAMAGE AND SECURITY 5 Upper Deck Assembly CHECKED FOR DAMAGE AND SECURITY 6 10 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 6 Upper Hitch and Hydraulic Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS 7 Upper Gooseneck and Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS 8 Chocks INSTALLED 9 Vehicle Hydraulic Tank SERVICED 10 LH Hitch Deck and Fender CHECKED FOR DAMAGE AND SECURED 11 Gooseneck Access Panels and Mud Flaps CHECKED AND SECURED 12 LH Door Hydraulic Cylinders Structure Cavity Drain Holes and Lights CHECKED FOR DAMAGE SECURITY AND LEAKS 13 Rear Bogie Axle Assembly Filters and Accumulators CHECK FOR DAMAGE LEAKS AND SECURITY MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 14 Tail Light Assemblies CHECKED FOR DAMAGE 15 Hitch Deck and Fender CHECKED AND SECURED DECOUPLED OPERATIONS The procedures are used to operate the chassis with the trailer removed decoupled Decoupled operations can only be attempted when the b
9. SPECIALTY HAULAGE SOLUTIONS FOR CONSTRUCTION AND MINING X 23 SAN V 4 24 A EGA CORP 700 Osuna Albuquerque NM 87113 1 800 345 8889 505 345 2661 Fax 505 345 6190 www megacorpinc com ETN MEGA Corp Inc All Rights Reserved L 1 i Ag 1 fr op P i i gt A A i i Ii LES Jh NT ie 1 am 4 PETI ary J k j j A A j qua i i A 4 4 4 D 4 7 1 A j i gt m a Er E 1 Section 1 Section 2 3 Section 4 Section 5 Section 6 MHT175 CAT777 G 1 1 Aug 2012 TABLE OF CONTENTS Page Definitions and Abbreviations seraient esas vem naine 1 1 System DeSCHDHODS fn TRUE dota E 2 Normal kaalu db EE ond UE 3 ER 4 1 Perlormance 5 1 ou M EUM EMEN a 6 1 MHT175 CAT777 G 1 1 Aug 2012 TABLE OF CONTENTS B Blank MHT175 CAT777 G 1 1 Aug 2012 SECTION 1 Definitions and Abbreviations Contents Description 1 1 MHT175 CAT777 G Overview 1 2 Warnings Cautions amp Notes 1 1 ADD VIAHONS d 1 3 Shall Will amp May 1 1 DESCRIPTION USE OF SHALL WILL AND MAY This technical manual con
10. and auxiliary equipment lighting All lighting is controlled by existing switches mounted in the cab or modified by dealers to operate at a junction box or added in cab control box 2 7 MHT175 CAT777 G 1 1 Aug 2012 MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description 2 8 Blank MHT175 CAT777 G 1 1 Aug 2012 SECTION 3 Limitations Contents Maximum Allowable Weights 3 1 MHT Gooseneck 3 1 MAXIMUM ALLOWABLE 2 OSCILLATION WEIGHTS The hitch ball 15 limited to 12 as shown 1 Maximum allowable gross machine weight below 15 627 202 1bs 284 494 kg 2 Maximum allowable load for the MHT is a 175 tons b 350 0001bs 158 758kg Operating the MHT above maximum load wil decrease structure component service life MHT GOOSENECK 1 ARTICULATION The gooseneck 15 limited to 90 articulation right and left of centerline trail as shown below Top View Gooseneck articulation beyond 90 will result in turn limit indicator to gooseneck stop contact Repeated contact may cause damage to stops and indicators 3 1 Hitch ball oscillations greater than 12 will result in hitch ball contact with hitch socket upper retaining plate Repeated contact may cause failure of upper hitch socket retaining plate bolts and reduce service of the hitch ball assembly MHT175 CAT777 G 1 1 Aug 2012 SECTION 3
11. communicate to maintain correct contact and maximum wheel to blade bit clearance MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description MHT AXLE 8 WHEEL GROUP The MHT trailer axle and wheel group 15 the same as the tractor drive axle assembly minus drive gear It is attached to the trailing axle frame by means of the same A frame hard pan rod and struts For more information see the CAT operators service manual and brake system information contained in this manual HITCH DECK AND FENDER The hitch deck and fender is modular in design and is comprised of three sub assemblies The assemblies are the hitch and saddles deck and fenders Hitch and Saddles nt cm P Constructed of steel plates and machined brass bushings assembly is mounted to the tractor chassis and pinned to the chassis pivot bores The machined brass bushings capture 2 3 the MHT hitch ball and transfer loads to the tractor Mounting 15 also provided for deck and fender assemblies Deck and Fenders SOS TS 4 7 id A Constructed of square steel tubes plates channels and grates that mounts to the hitch and saddle assembly The assembly contains fenders mud flaps maintenance access doors walkway and a work platform Turn Limit Indicator Mechanical Turn Limit Indicator Gooseneck Stop 4 3 Constructed of steel plate and mounted to the tractor
12. cy slick when determining a means to decelerate or stop MHT Service Brakes The tractor and MHT service brakes are activated by pressing on the brake control pedal Pilot signal pressure from the tractor proportions brake valves allowing accumulator pressure to be routed to the slack adjusters and apply the brakes Accumulators 15 eguipped with one additional accumulators mounted on the trailing axle frame that ensure brake activation pressure 15 available in close proximity to the rear axle brakes MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description Brake Valve amp Slack Adjuster Groups The MHT is configured with two different brake valve and slack adjuster groups One 15 mounted in the trailer rear axle and the other 15 on the tractor chassis on the rear frame EI Slack Adjusters Tractor Brake Valve The trailer brake valve will route activation pressure to the trailer slack adjuster to apply trailer brakes The activation should occur first in the sequencing of the three axles trailer tractor drive and tractor steering This built in delay ensures the trailer stays in trail during initial brake applications The tractor drive axle brake valve will route activation pressure to the chassis drive axle slack adjusters to apply drive axle brakes This activation will be slowed down by restrictors in the drive axle brake valve circuit This delay will allow
13. drive axle activation to occur second in the braking sequence Finally the steering tire slack adjuster will receive activation pressure at a further reduced rate because of smaller restrictors feeding the steering wheel slack adjuster This delay will ensure steering wheel activation occurs last in the braking sequence Secondary Brake System The tractor and MHT secondary braking are activated by pressing on the secondary brake control pedal This action opens the brake retract circuit allowing the spring activated Parking Brake System The tractor and MHT parking brake activated by moving the gear selector lever to the park position P This action opens the brake retract circuit allowing the spring activated parking brake to be applied Brake Cooling System The MHT axles receive brake cooling oil from the tractor torque converter through the oil cooler circuit Oil is returned to the tractor cooling circuit through the added scavenge pump Scavenge Pump Added Scavenge Pump Brake Pump wk Hoist Brake Cooling Pump An additional scavenge pump was added to assist in pulling MHT brake cooling oil back into the tractor cooling circuit This scavenge pump is mounted between the tractor brake cooling pump and the brake pump Several restrictors were added on the steering tire cooling circuit to allow proper oil return flow from the trailer Otherwise the tractor drive axle cooling circuit 15 unchanged and ope
14. e MHT system before use or beginning of the shift This inspection is in addition to and does not replace the CAT 777 G inspection requirements Vehicle Engine AS REQUIRED Chocks INSTALLED Transmission Control Lever P Park Hoist Control Lever HOLD Hitch Ball Retaining Plate CHECKED FOR DAMAGE AND SECURITY Lift ball skirt and check for loose or sheared bolt heads Turn Limit Indicator CHECKED FOR SECURITY AND DAMAGE 6 3 This inspection is in 1 Aug 2012 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix Po ere eee MHT175 CAT777 G CL 1 1 Aug 2012 7 Upper Deck Assembly CHECKED FOR DAMAGE AND SECURITY 6 Upper Hitch and Hydraulic Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS 9 Upper Gooseneck and Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS 10 Chassis Hydraulic Tank SERVICED 11 LH Hitch Deck and Fender CHECKED AND SECURED 12 Gooseneck Access Panels and Mud Flaps CHECKED AND SECURED 13 LH Door Hydraulic Cylinders Structure Cavity Drain Holes and Lights CHECKED FOR DAMAGE SECURITY AND LEAKS 14 Trailer Axle Frame Assembly Axle Assembly manifolds and Accumulators CHECK FOR DAMAGE SECURITY AND LEAKS 6 4 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 15 Tail Lights Assemblies CHECKED FOR DAMAGE 16 RH Door Hydraulic Cylinders Structure Cavity Drain Holes and Lights CHEC
15. ectrical system components Components can be accessed through the manhole covers mounted on the upper deck The walls are constructed of steel tubes and plates They provide for mounting of clearance lights side boards and load markers 2 1 MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description Trailing Axle Frame Assembly The trailing bogie 1s constructed of sguare steel tubes and plates The assembly provides mounting for the rear axle assembly associated brake system accumulators filters manifolds and light The rear of the bogie also contains a push type bumper assembly The bumper be configured as a push block or wrap around style The design provides a pushing point to assist the MHT up a grade in low traction conditions wet muddy or icy haul road The bumper assembly is designed to be pushed straight on by the pushing boosting machine Wrap Around Style Push Block Style 1 N 4 2 2 Proper straight on contact between MHT and pushing boosting machine is shown below Routine hard bumper contacts by the pushing boosting machine will cause structural fatigue and result in reduced trailer service life Angled blade contact of the push block style bumper will reduce bull dozer blade to MHT wheel clearance Extreme blade angles will cause blade bit to wheel contact and damage MHT tires MHT and pushing boosting machine operators must
16. ediate position 6 8 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix memme MHT175 CAT777 G CL 1 1 Aug 2012 5 When opening the dump doors they should not be opened up all the way to keep material from flowing underneath the trailer tires The doors should be opened slowly by bumping the dump lever Three to four bumps on the dump lever is all that is required Use intermediate door position system if equipped 6 The operator should string out the load so that the trailer doesn t ride up on the coal that 15 being dumped Hitch ball oscillations greater than 12 will result in hitch ball contact with hitch socket upper retaining plate Repeated contact may cause failure of upper hitch socket retaining plate bolts and reduce service life of the hitch ball assembly 7 Once the trailer has been dumped the operator can then allow the truck to shift as necessary while he she is closing the doors 8 Once the doors have reached the closed position the operator must then return the dump lever to the hold position with no hesitation in the float setting 6 9 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix D MHT175 CAT777 G CL 1 1 Aug 2012 9 f there 1s any hesitation passing through the float position the operator must reopen the doors slightly and close them again without hesitation 10 Continue safely back to the pit driving appropriate to the road conditions AFTER OPERATI
17. ermine a safe ground speed for the dump pass based on environmental road conditions stockpile route and appropriate material flow to prevent trailer axle high centering or hitch over oscillation After the unit has entered the stockpile and is locked in the correct gear and is in a straight line with the desired ground speed established the dump doors can be opened to an intermediate position When opening the dump doors they should not be opened up all the way to keep material from flowing underneath the trailer tires The doors should be opened slowly by bumping the dump lever Three to four bumps on the dump lever is all that is required Use intermediate door position system if equipped The operator should string out the load so that the trailer doesn t ride up on the coal that is being dumped MHT175 CAT777 G 1 1 Aug 2012 SECTION 3 Normal Operations Hitch ball oscillations greater than 12 will result in hitch ball contact with hitch socket upper retaining plate Repeated contact may cause failure of upper hitch socket retaining plate bolts and reduce service life of the hitch ball assembly 7 Once the trailer has been dumped the operator can then allow the truck to shift as necessary while he she is closing the doors 8 Once the doors have reached the closed position the operator must then return the dump lever to the hold position with no hesitation in the float setting 9 If there is any hesita
18. i pounds per square inch 1 3 MHT175 CAT777 G 1 1 Aug 2012 MHT175 CAT777 G 1 1 Aug 2012 SECTION 1 Definitions and Abbreviations 1 4 Blank MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description Contents Coal Hauler Body MHT 2 1 MHT Door System 2 6 MHT Axle amp Wheel Group 2 3 MHT Lube System 2 7 Hitch Deck amp Fender 2 3 MHT Lighting System 2 7 MHT Brake System 2 4 COAL HAULER BODY MHT Lower Hopper Assembly The MEGA 175 ton coal hauler is modular in construction and comprised of four major sub assemblies The sub assemblies are the gooseneck lower hopper side walls and the rear bogie Gooseneck Assembly The assembly is constructed of square steel tubes bolsters and plates It provides for mounting of door assemblies hydraulic actuators and lubrication blocks The bolster passage ways provide for the routing and protection of hydraulic brake and door hosing as well as electrical cabling Side Wall Assembly The assembly is constructed of square steel tubes plates and channels It contains an 18 diameter hitch ball designed to be captured in the tractor hitch socket allowing the trailer to be towed The compartment formed by the gooseneck plating 15 used for mounting and routing of all brake door and el
19. ng temperatures to ensure brakes are not dragging or a malfunction exists in the cooling circuit 4 6 MHT175 CAT777 G 1 1 Aug 2012 SECTION 5 Performance Loading MHT LOADING Figure 5 1 illustrates correct load placement and height A ES Te 2 oO UU Figure 5 1 Load Placement 4 Height 5 1 MHT175 CAT777 G 1 1 Aug 2012 SECTION 5 Performance Loading 5 2 Blank MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 I MEGA Sr MHT175 OPERATORS CHECKLIST 6 1 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 TABLE OF CONTENTS Title Page 1 BEFORE N 2 2 OPERATIONS A Loading Stationary or Moving N 4 Transiting with a Load N 5 Cx Unions N 6 3 AFTEROPERATIONS 7 4 DECOUPLED OPERATIONS 59 N 1 6 2 MHT175 CAT777 G 1 SECTION 6 Appendix Po l 2 MHT175 CAT777 G CL 1 1 Aug 2012 BEFORE OPERATIONS These procedures are used to perform a walk around inspection of the MHT175 CAT777 G system before use or beginning of the shift addition to and does not replace the CAT 777 G inspection requirements These procedures are used to perform a walk around inspection of th
20. ormally installed on the MHT lower hopper assembly The door switch is intended to contact the inner door swing arm when the dump doors in the closed position and extinguish the dump body warning light When the doors are open the switch will illuminate the dump body warning light Under warning light conditions the ECM will only allow preprogrammed low gear operations SECTION 2 System Description Intermediate Door Position Indicator If Equipped A system that contains a cab mounted indicator box and an additional door position proximity switch The indicator switch is normally installed on the MHT LH lower hopper assembly The door switch is intended to contact the inner door swing arm when the dump doors are in a customer determined intermediate position When doors are open to a customer determined position the cab control box will illuminate a green light and provide an audio tone This system is designed to assist operators in reduce control windrow heights when performing stockpile operations MHT LUBE SYSTEM The MHT is lubricated through central lubrication blocks that may be connected to the tractor auto lube system if installed Lubrication blocks service MHT axle A frame hardpan rod axle struts hydraulic cylinder pins and hitch ball socket assembly MHT LIGHTING SYSTEM The system contains brake turn signal backing clearance and work lights Some optional lighting features may include load backing
21. ped off 10 fitting F Trailer service brake signal in and out ports 8 fittings Control System G Chassis mounted junction box or Y harness connection is configured or jumpered to allow normal tail light and backup alarm functions 7 Ensure hitch and deck area are clear of tools and debris 6 14 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 8 Vehicle Engine Start 9 While machine 15 running and parking brake function is assured check reconfigured manifolds for leaks 10 Check brake lights turn signals and back up alarm are functioning properly 11 Chocks REMOVED 12 Front Brake Activation Switch ON 13 Ensure parking brake is functioning Ensure parking brake advisory light illuminates when gear selector is in park P Do not operate the machine if the parking brake system is malfunctioning or inoperative 14 Gear Selector Lever D Drive i OPERATION 6 15 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 15 At 3 5 MPH activate the service brake to ensure proper function Do not operate the machine if the service brake system is malfunctioning or inoperative 16 Once all brake and control systems are operating properly move the machine as required
22. rake and associated control systems are reconfigured for decoupled operations Do not operate the chassis decoupled from the trailer unless the brake and associated control systems are configured properly Failure to ensure proper brake system reconfiguration exists may result in inoperative service parking and secondary brake systems operating the chassis with inoperative brake systems mat result in personal injury or death 6 12 SECTION 6 Appendix MHT175 CAT777 G 1 1 MHT175 CAT777 G CL 1 1 Aug 2012 INSPECTION Vehicle Engine AS REOUIRED Chocks INSTALLED Transmission Control Lever P Park Hoist Control Lever HOLD Gain access to forward hitch area by using the deck assembly Identify the LT and RT junction manifolds Confirm with Maintenance and perform actual inspection of the chassis systems to ensure the following brake and control system configuration Brake Cooling Manifold RT side A A jumper hose connect the brake cooling port to the brake return port 6 13 32 fitting 1 Aug 2012 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix MHT175 CAT777 G CL 1 1 Aug 2012 Brake Activation Manifold LT B Grease port trailer supply port is capped of f 8 fitting C Brake accumulator trailer supply port is capped off 16 fitting D Trailer service return port 15 capped off 16 fitting E Trailer E Brake Parking brake retract supply port is cap
23. rates per the CAT service operators manual MHT175 CAT777 G 1 1 Aug 2012 SECTION 2 System Description MHT DOORSYSTEM The system 1s comprised of two hinged doors activation cylinders hosing and a proximity switch optional The hydraulic door cylinders are powered hydraulics from the tractor hoist valve and controlled by the in cab hoist control lever to open and close the doors Hydraulics Doors are opened and closed by hydraulic cylinders that are mounted on the doors ends standard or center optional These cylinders use hydraulic pressure routed from the tractor hoist valve to open and close the doors The RAISE side of the hoist valve is used to open the doors while the LOWER side of the hoist valve is used to close the doors Control of the doors is commanded by use of the in cab hoist control lever 2 6 Hoist Control Lever Hoist Control Lever Mounted in the cab and used to open and close the MHT doors The lever is labeled for dump body operations and performs the four functions of RAISE HOLD FLOAT and LOWER See the CAT 777 G operators manual for more system information The MHT uses the in cab hoist control lever functions as follows RAISE Open MHT doors HOLD Hold MHT doors in fixed position for transiting haul roads with or without a load FLOAT Disable by ECM software for trailer MHT applications LOWER Close MHT doors Door Indicator A door indicator switch is n
24. rning Light OFF UNLOADING Stationary 1 Position MHT for unloading 2 Brakes As Required 3 Hoist Control Lever AS DESIRED TO DUMP LOAD Once load 16 dumped 4 Hoist Control Lever LOWER Doors fully closed then immediately to HOLD If doors do not fully close and the body position light is on cycle the hoist control lever to LOWER doors closed then immediately back to HOLD Ensure the body position warning light is off ip Ap nS mt mm yt mm 6 d 6 7 1 Aug 2012 MHT175 CAT777 G 1 1 Aug 2012 SECTION 6 Appendix pc Es MHT175 CAT777 G CL 1 1 Aug 2012 5 Hoist Control Lever HOLD UNLOADING Moving It is highly recommended a dozer be available to keep dump entry and exit paths level during stockpile operations 1 When entering stockpile to dump find a level area that will not require any turning once the dump has started 2 The truck should be locked in first or second gear 3 Determine a safe ground speed for the dump pass based on environmental road conditions stockpile route and appropriate material flow to prevent trailer axle high centering or hitch over oscillation 4 After the unit has entered the stockpile and is locked in the correct gear and 15 in a straight line with the desired ground speed established the dump doors can be opened to an interm
25. sult in personal injury or ports 8 fittings death Control System INSPECTION Chassis mounted junction box or Y 1 Vehicle Engine AS REOUIERED harness connection is configured jumpered to allow normal tail light 2 Chocks INSTALLED and backup alarm functions 3 Transmission Control Lever P Park 7 Ensure hitch and deck area are clear of tools and debris 4 Hoist Control Lever HOLD 8 Vehicle Engine Start 5 Gain access to forward hitch area by using the deck assembly Identify the LT and RT junction manifolds 4 5 MHT175 CAT777 G 1 1 Aug 2012 SECTION 3 Normal Operations 9 While machine is running and parking brake function 15 assured check reconfigured manifolds for leaks 10 Check brake lights turn signals and back up alarm are functioning properly 11 Chocks REMOVED OPERATION 12 Front Brake Activation Switch ON 13 Ensure parking brake is functioning Ensure parking brake advisory light illuminates when gear selector is in park P Do not operate the machine if the parking brake system is malfunctioning or inoperative 14 Gear Selector Lever D Drive 15 At 3 5 MPH activate the service brake to ensure proper function Do not operate the machine if the service brake system is malfunctioning or inoperative 16 Once all brake and control systems are operating properly move the machine as required 17 Continue to monitor brake cooli
26. tains information required to safely operate the MHT175 Shall and Will Used when application of a CAT777 G See the CAT 777G Operations procedure 15 mandatory and Safety manual for additional information specific to the CAT 777G chassis Should Used when application of a WARNINGS CAUTIONS AND procedure is recommended NOTES May Used to indicate an acceptable or The following definitions are found suggested means of accomplishment throughout the manual and apply as follows Operating procedures and techniques which could result in personal injury and or loss of life 1f not carefully followed Operating procedures and techniques which could result in damage to equipment if not carefully followed Operating procedures and techniques that are considered essential to emphasis 1 1 75 1 Aug 2012 View sl 2 9 e 2 CAT777 G 1 GOOSENECK LOWER HOPPER SIDE WALL REAR BOGIE REAR AXLE amp WHEEL GROUP HITCH amp SADDLE SECTION 1 Definitions and Abbreviations MHT175 Overview 1 2 E le h DECK amp FENDER TURN LIMIT INDICATOR SPILL GUARD SIDE BOARDS END OF LOAD INDICATORS SECTION 1 Definitions and Abbreviations ABBREVIATIONS tt feet gpm gallons per minute kg kilograms km h kilometers per hour Ibs pounds MHT MEGA Coal Hauler MHT MEGA Hauler with Truck mph miles per hour ps
27. tion passing through the float position the operator must reopen the doors slightly and close them again without hesitation 10 Continue Safely back to the pit driving appropriate to the road conditions AFTER OPERATIONS These procedures are used to perform a walk around inspection after using the 175 CAT777 G system This inspection is in addition to and does not replace the CAT 777 G inspection requirements 1 Vehicle Engine AS REQUIRED 2 Chocks INSTALLED AS REQUIRED 3 Transmission Control Lever P Park 4 Hoist Control Lever HOLD 4 4 10 11 12 13 14 15 Hitch Ball Retaining Plate CHECKED FOR DAMAGE AND SECURITY Lift ball skirt and check for loose or sheared bolt heads Turn Limit Indicator CHECKED FOR SECURITY AND DAMAGE Upper Deck Assembly CHECKED FOR DAMAGE AND SECURITY Upper Hitch and Hydraulic Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS Upper Gooseneck and Hosing CHECKED FOR DAMAGE SECURITY AND LEAKS Chassis Hydraulic Tank SERVICED LH Hitch Deck and Fender CHECKED AND SECURED Gooseneck Access Panels and Mud Flaps CHECKED AND SECURED LH Door Hydraulic Cylinders Structure Cavity Drain Holes and Lights CHECKED FOR DAMAGE SECURITY AND LEAKS Trailer Axle Frame Assembly Axle Assembly Manifolds and Accumulators CHECK FOR DAMAGE SECURITY AND LEAKS Tail Light Assemblies CHECKED FOR DAMAGE MHT175 C
Download Pdf Manuals
Related Search