SCREW 0801911 - Caterpillar

The manifold assembly contains the following valves.High Pressure Relief Valve CartridgesShuttle ValveCharge Relief Valve The O-ring should be placed in the port with the full counterbore. The O-rings and back-up rings fit in the ports with the machined grooves. The O-ring should be installed first and then the back-up ring. When installing the manifold on the end cap be certain the back-up rings are properly installed and do not slip out of the grooves. To repair the Shuttle Valve, remove both hex. plugs, springs, washers and spool from the manifold. These parts are interchangeable and can be installed on either side of the manifold. The spool and manifold are a select fit and must be replaced together. To install, slide the spool into the bore, place a washer on each end, then slide both springs in place. Install the hex. plugs and tighten. To repair the Charge Relief Valve, remove the hex. plug, spring and poppet. Remove the shims from the counterbore of the hex. plug. Do not alter these shims unless new parts are used, in which case the valve must be re-shimmed to the proper setting. To re-install, insert the poppet, spring and plug, being certain the shims are in place. The valve manifold assembly can be removed from the motor and replaced in its entirety. The following procedure shows removal of the entire manifold from the Motor before performing further disassembly. Remove the six (6) hex. cap screws and lift the manifold off the motor end cap. The three (3) ports are sealed with O-rings and the two (2) adjacent ports also have back-up rings on top of the O-rings. These are rectangular in cross section and slightly cupped on one side where they mate with the O-rings. Insert the stationary seal pilot into the aluminum housing, locating the notch in the stationary seal over the pin in the housing. Install the O-ring on the O.D. of the housing then slide it into place against the bronze sealing ring. Since this is a spring loaded assembly, it may be necessary to push against the aluminum housing to expose the retaining ring groove. Install the retaining ring 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. The High Pressure Relief Valves are cartridges that are removed by unscrewing them from the manifold. These valves are factory set and the first two (2) numbers of the pressure setting are stamped on the end of the valve. These valves are interchangeable and can be installed in either side of the manifold, providing the pressure settings are the same. The bronze sealing ring is also held in place by internal O-ring friction. Work this part free and carefully slide over the shaft.
This part is easily damaged and care must be exercised when handling.
All of the shaft seal parts, which are included in the Shaft Seal Kit, have now been removed.