Displacement Pump- cont - TM-5-3820-256-24-1

Displacement Pump- cont - TM-5-3820-256-24-1_106

Displacement Pump- cont - TM-5-3820-256-24-1_108

TM-5-3820-256-24-1 Drilling System Manual
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z. Unscrew the servo housings (38) using channellock pliers to grip the flats on top of the housings. NOTE At this time the servo springs (50) should be removed if replacement is necessary as the pump housing will provide a means of leverage when breaking the screws loose. Do not reuse the screw (51) holding the spring (50) to the servo piston (54) as it has a nylon locking insert that is not effective when reused. These springs should not be removed unless necessary. aa. To remove springs, remove screw (51), washer (52), retainer (53) and spring (50). ab. The trunnions (55) should be marked to insure reassembly to the correct side of the housing. Remove the hex, head screws (56) and washers (57) from each trunnion (55). NOTE Friction caused by the O-ring (58) on the trunnion may make it necessary to use a slide hammer to pull the trunnion assembly. ac. Remove the trunnions (55) from housing. Be certain to keep the plastic shims (59) with the proper trunnion to insure satisfactory bearing adjustment after reassembly. If bearing (60) is to be removed, it must be pulled from the shaft of trunnion (55). The race (61) is a press fit in swashplate (46). ad. After both trunnion assemblies have been removed, the swashplate assembly can be removed from the pump housing (70). The piston (54), pins (62,63, 64), snap rings (65, 66, 67) and links (68,69) may remain installed on swashplate (46) unless parts are being replaced. 4-6.5.2 Assembly a. When installing the swashplate assembly (46) into the housing (70), the feedback link (68) must be laid back along the top of the swashplate so it can be reached through the opening for the control valve. After installing swashplate be certain feedback link is accessible. b. Press bearings (60) onto shafts of trunnions (55). Place shims (59) and O-rings (58) on trunnions. c. Install the trunnions (55), checking for proper orientation with the housing (70) and install the cap screws (56) and washers (57). The swashplate (46) should have no sideplay yet rotate freely. If necessary, alter the plastic shims (59) to obtain the proper adjustment. Torque screws (56) to 16-21 ft-lbs. 4-76

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