GH40 N2 Charge Times Font
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1. with pressure regulator assembly nitrogen fill hose quick connect coupler Fig 7 3 Remove cap from nitrogen charge port Fig 7 4 Nitrogen charge valve and lock nut Service Manual Hammer Member Page 21 Geoprobe GH 40 Hammer Fig 7 11 Unthread the charge valve adapter center stem out from the hex cap Fig 7 12 Check for dripping oil around base plate and piston Fig 7 13 Check for dripping oil from hex drive Service Manual Hammer Member Page 23 Geoprobe GH 40 Hammer2. This document describes charging the GH40 Hydraulic Hammer with nitrogen gas Text and illustrations were taken directly from the service manual shown below GEOPROBE GH40 HYDRAULIC HAMMER SERVICE MANUAL Technical Bulletin No 95 040 PREPARED February 1995 REVISED April 2002 GEOPROBE GH40 HYDRAULIC HAMMER l Geoprobe Systems A DIVISION OF KEJR INC COPYRIGHTO 2002 2000 1995 Kejr Inc ALL RIGHTS RESERVED No part of this publication may be reproducedor transmitted in any form or by any means electronic or mechanical including photocopy recording or any information storage and retrieval system without permission in writing from Kejr Inc WARRANTY Geoprobe Systems warrants its products to be free from defects in materials and workmanship under normal use and service for a period of one hundred eighty 180 days from the date of delivery to the client Geoprobe Systems will repair or replace any product returned to Salina Kansas which appears upon inspection by Geoprobe Systems to be defective in materials or workmanship Geoprobe Systems shall have no obligation under this warranty for the cost of labor down time transportation charges or for repair or replacement of any product which has been misused carelessly handled or modified or altered All other warranties of every kind whether expressed or implied including but not limited to any implied warranty of merchantability or of fitness for a
3. cess to the nitrogen charge valve shown in Figure 7 4 7 3 Loosen the lock nut on the nitrogen charge valve by turning it counterclockwise one complete revolution with a 5 8 socket Fig 7 5 7 4 Thread the large hex cap of the charge valve adapter into the nitrogen port on the hammer Fig 7 6 Install the adapter finger tight but with sufficient torque to seat the O ring within the port 7 5 Thread the center stem of the charge valve adapter in toward the hammer until it is finger tight Fig 7 7 7 6 Attach the quick connect coupler on the end of the nitrogen fill hose to the quick connect nipple on the charge valve adapter as shown in Figure 7 8 7 7 Ensure that the line pressure in the nitrogen fill hose is set at zero by turning the regulator tee handle Fig 7 9 counterclockwise until it turns freely 7 8 Open the main valve on the nitrogen cylinder Fig 7 10 by turning the handle counterclockwise 7 9 Slowly turn the regulator tee handle Fig 7 9 clockwise until the line pressure gauge reads 650 psi IMPORTANT DO NOT overcharge the system Charging the system beyond 650 psi will rupture the accumulator diaphragm or otherwise damage the hammer 7 10 Close the main valve on the nitrogen gas cylinder Fig 7 10 by turning the handle clockwise 7 11 Unthread the charge valve adapter center stem several revolutions out from the hex cap Fig 7 11 7 12 Rotate the regulator tee handle Fig 7 9 counterclockwise until the line pressure
4. gauge reads 650 psi pressure is releaved 7 13 Remove the charge valve adapter from the hammer by unthreading the large hex cap Detach the adapter from the nitrogen fill hose at the quick connect fittings Service Manual Hammer Member Page 20 Geoprobe GH 40 Hammer 7 14 Snug the lock nut on the nitrogen charge valve loosened in Step 7 3 using a rachet and a 5 8 socket Fig 7 20 DO NOT OVERTIGHTEN 7 15 Listen for a hissing sound around the charge valve and accumulator housing Check for dripping oil around the base plate and piston if hammer member is removed as in Figure 7 12 or from the hex drive if the hammer is installed as in Figure 7 13 Obvious leaks such as those described above would indicate a defective accumulator diaphragm in the hammer member If the accumulator diaphragm has failed the hammer member must be sent to the Geoprobe factory in Salina Kansas for repair 7 16 Reinstall the nitrogen charge port cap that was removed in Step 7 2 7 17 Nitrogen recharge 1s complete IMPORTANT Do not transport the nitrogen gas cylinder without first removing the regulator assembly Alwayssecure the cylinder during transport to prevent shifting or rolling while the vehicle is in motion These are important safety issures as the cylinder can be propelled at a high rate of speed if the regulator or valve were to be damaged during transport Fig 7 1 Nitrogen gas cylinder with Fig 7 2 Charge valve adapter left shown
5. particular purpose and all claims for consequential damages are specifically disclaimed and excluded Geoprobe Systems is a Division of Kejr Inc located at 601 North Broadway in Salina Kansas 67401 Telephone 1 800 436 7762 785 825 1842 Fax 785 825 2097 Geoprobe and Geoprobe Systems are registered trademarks of Kejr Inc in Salina KS 7 0 RECHARGING NITROGEN IN GH 40 HAMMER Should the Geoprobe operator experience inconsistency with the percussion function of the GH 40 Hammer one possible culprit could be a lack of nitrogen charge in the hammer member accumulator chamber The percussion function may lack snap or completely fail as a result of inadequate nitrogen charge Though hammer failure due to a lack of nitrogen is rare recharging the hammer member will eliminate the possibility that an inadequate nitrogen charge is contributing to hammer member failure NOTE The following recharge procedure requires the use of a cylinder of industrial quality nitrogen gas a pressure regulator assembly Fig 7 1 and a charge valve adapter Fig 7 2 These are included in the GH 40 Nitrogen Charge Kit FA3100K available from Geoprobe Systems 7 1 Fold the probe derrick into the vertical position lower the foot onto the ground and raise the hammer to approximately waist level Shut off the power unit engine 7 2 Remove the cap from the nitrogen charge port using a 1 3 8 wrench or socket as shown in Figure 7 3 This will provide ac
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