TUBE 3496160 - Caterpillar

Be certain to keep the plastic shims with the proper trunnion to insure satisfactory bearing adjustment after reassembly. After both trunnion assemblies have been removed, the swashplate assembly can be removed from the pump housing. Layout of parts showing swashplate, servo pistons and springs, feedback link and trunnions. When installing the swashplate assembly into the housing, the feedback link 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. Install the trunnions, checking for proper orientation with the housing and tighten the cap screws. The swashplate should have no sideplay yet rotate freely. If necessary, alter the plastic shims to obtain the proper adjustment. Install and tighten the trunnion cap screws. Install the servo springs, if these parts were removed, using new screws. The servo housings should be installed next. Slide the housing over the servo piston and thread it into the pump housing. Adjust the housing to the height and rotational position as determined by the markings made during disassembly. The neutral (zero angle) position of the swashplate must now be checked using a depth micrometer.The thrust plate must be installed on the swashplate for this measurement. Measure the distance from the end cap mounting face of the pump housing to the face of the thrust plate 90° to the trunnions, at the outer edge of the thrust plate. Take the same measurement at a point 180° (opposite edge of the thrust plate) from the first. These measurements must not vary more than .001" from each other. If adjustment is required follow these steps.a. Back out both servo housings until the spring load is released on the swashplate (check by rocking swashplate).b. Thread in each housing until spring load just starts to be felt on the swashplate.c. Check measurements as described previously.d. Thread each housing farther in until the measurements are within .001" of each other. After adjustment has been completed, the retainers can be installed and peened into the locking slot on the housing. Remove the thrust plate and set the pump on the servo housings.Insert the shaft and bearing assembly through the cast hole in the swashplate, allowing the bearing to rest on the cast leveled edge. If any of those parts are replaced, the shaft end play must be checked.Drive Shaft - Bearings - Housing - Front Cover - End CapTo check the shaft end play, assemble the above parts plus the gaskets. The shaft end play should be from .006" to .016". If adjustment is necessary, a shim can be placed under the bearing race in the end cap. Disassemble these parts and resume reassembly procedure. Install the front cover and gasket, being certain that the locating pins are in place in the housing. These parts will go on only one way and have all the mounting holes align with the housing.Turn the unit on its side with the large