GH-BETTIS OPERATING INSTRUCTIONS M4 HYDRAULIC
Contents
1. GH BETTIS OPERATING INSTRUCTIONS M4 HYDRAULIC CONTROL SYSTEM PART NUMBER 074950 REVISION A RELEASE DATE May 1991 REPLACES Service 085 Dated 10 87 GH Bettis P N 074950 Page 1 of 3 Revision A SYSTEM DESCRIPTION The M4 Hydraulic Control System is a compact modular system designed for use with GH Bettis double acting actuators The system utilizing a bi directional rotary pump which disengages during power operation individually adjustable speed control and a make up oil reservoir necessitates by the differential volume of the hydraulic cylinder due to the piston rod The unit must be mounted upright with handle shaft horizontal The reservoir fill plug must be removed and replaced with the breather supplied before operation POWER OPERATION Power operation requires that hydraulic fluid be dislocated during each stroke as the piston moves within the hydraulic control cylinder Two individually field adjustable flow controls integrally mounted in the control module provide controlled opening and closing speeds Adjustments are made by loosening the locknut and turning the control valve stem with a screwdriver Turn the stem clockwise to decrease the operating speed increases time per stroke Turning the adjustments fully clockwise will prevent fluid flow and actuator rotation provided fluid relief pressure are not exceeded MANUAL OPERATION Before attempting to manually operate the M4 bleed off and rem2. d maintenance for the M4 module and pump The only time the M4 module and pump should be disassembled is when the system fails to perform its hydraulic control function If maintenance is required and when possible the M4 package should be returned to the factory for maintenance More detailed information concerning you particular application may be obtained by writing or faxing GH Bettis P O Box 507 Waller Texas 77484 USA Telephone 713 463 5100 or 409 372 3606 FAX 713 463 5103 Telex 686804
3. ove all pressure to the actuator NOTE Make sure both ends of the cylinder s are exhausted and vented to the atmosphere Manual operation is accomplished by rotating the pump handle Clockwise rotation of the pump handle produces clockwise rotation of the actuator and drives the valve closed Counterclockwise rotation of the pump handle produces counterclockwise rotation of the actuator and drives the valve open GENERAL INFORMATION The fluid level within the reservoir will fluctuate slightly during operation Operate the unit manually while observing the fluid level It is important that the lowest fluid level not be less than approximately 1 4 of the reservoir volume Allowing the fluid supply to be depleted causes air to enter the system and actuator cylinders Air in the system will cause the pump to cavitate rendering it useless Erratic speed control characteristics will be noticed GH Bettis P N 074950 Page 2 of 3 Revision A FLUID REQUIREMENTS 1 Standard and high temperature service 35 F to 350 F use Dexron II Automatic Transmission Fluid 2 Low temperature service 65 F to 180 F Use Exxon Univis J13 Hydraulic Fluid REFILLING INSTRUCTIONS 1 Put the actuator in the closed position CW 2 Remove the breather from the reservoir 3 Fill the reservoir approximately three fourths 3 4 full see Fluid Requirements for proper fluid specification 4 Open both speed control valves 5 Open the bleed valves on
4. the outboard end of the hydraulic cylinder only 6 Rotate the pump handle slowly clockwise until all air has escaped from the system T Close the bleed valve opened in step 5 NOTE During the fill procedure it is important the lowest fluid level be not less than approximately one fourth 1 4 of the reservoir volume at any time 8 Open the bleed valve on the inboard end of the hydraulic cylinder 9 Rotate the pump handle slowly counterclockwise until all air has escaped from the system 10 Close the bleed valve opened in step 8 NOTE During the fill procedure the piston will not move This may be determined by observing the position indicator on the actuator 11 Adjust fluid level to 172 40mm from top of reservoir with actuator in open CCW positions GH Bettis P N 074950 Page 3 of 3 Revision A To insure air is removed from the system most likely air in pump and to test the operating of the M4 system do steps 12 1 through 12 3 Rotate the M4 pump handle CW The actuator should move clockwise as well Adjust outboard bleed valve to remove air from system Rotate the M4 pump handle CCW The actuator will move counterclockwise Adjust inboard bleed valve to remove air from system With bleed valves closed stroke actuator full 90 CW and CCW using M4 Hydraulic Control System Re install breather removed in step 2 12 12 1 12 2 12 3 13 MAINTENANCE GH Bettis does not recommend periodic fiel
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