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

TM-5-3820-256-24-1 Drilling System Manual
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s. Lubricate the end cap (25) face with clean hydraulic oil. Install the valve plate (28) so that the slot locates over the pin and the center bore fits over the protruding bearing race (29). Place the end cap gasket (26) on the housing (70), being certain the locating pins (72) are in place, then install the O-ring (27) in the counter bore in the housing (70). t. Install the end cap (25) and valve plate (28), holding the valve plate so it does not drop off during assembly. The end cap will align with the housing mounting holes in one position only. u. Install two screws (22, 23) and tighten alternately until the internal spring has compressed far enough for the end cap (25) to rest on the housing (70). Install the remaining cap screws and torque to 27-37 ft. lbs. v. Install O-ring (6) in bronze sealing ring (5). Place the six or more springs that are part of the seal assembly (7) in the cavities in the housing (70). Wrap the end of the shaft (45) to protect parts from damage and install sealing ring (5) over shaft with O-ring facing pump. Use hand force only to install. w. Install o-ring (4) in housing (2) and insert the stationary seal pilot (4A) into the aluminum housing (2), locating the notch in the stationary seal over the pin in the housing. x. Install the O-ring (3) on the outside diameter of the housing (2) then slide it into place against the bronze sealing ring (5). Since this is a spring loaded assembly, it may be necessary to push against the aluminum housing to expose the retaining ring groove. y. Install the retaining ring (1) with the beveled side out, putting the side opposite the tangs into the groove first. Be certain that the retaining ring has snapped into its groove completely. z. Place a new gasket (18) on the housing, and place the orifice plate and O-rings (17) in the control (16). aa. install the connecting pin (21) through the control linkage and the feedback link (68) on the swashplate (46) with the headed side toward the center of the pump. Use caution not to drop parts into the pump housing. Install washer (20) and cotter pin (19). ab. Swing the control (16) into place against the housing (70), being certain the orifice and O-rings are in place, then install cap screws (14) and torque to 10-11 ft-lbs. NOTE Check valves (12) are cartridges and are interchangeable with each other. It is suggested that these check valves be replaced in pairs. 4-79

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