Vane and rotor wear can be checked by inserting the vane in the rotor slot and checking for excessive play.
Replace the rotor and vanes if wear is evident.
Rotate the bearing while applying pressure to check for wear, looseness, and pitted or cracked races. Check
seal and bushing mating surfaces on the shaft for scoring or wear. Replace shaft if marks cannot be removed by
4-19.4.3 Assembly and Installation
Coat all parts except seals and back-up rings with clean hydraulic fluid to facilitate assembly and provide initial
lubrication. Use small amounts of petroleum jelly to hold the o-rings in place during assembly.
During handling and shipping of precision machines cartridge parts, it is possible to raise burrs on the sharp
edges. All sharp edges on the parts of a new cartridge kit should be stoned prior to installation.
Assemble the cartridge. The direction of rotation is as viewed from the shaft end; right hand rotation is
clockwise; left hand, counterclockwise.
If pins (11) were removed from inlet support plate, install new pins, driving them with a rubber
or plastic hammer.
Place the inlet and outlet support plates (9, 13) on a flat surface. Install seal packs (10) into cavities with seal
retainer surface up. Place flex side plate (12) over each of the support plates with bronze wear surface facing
up. Aline scribe marks to make sure the correct flex side plate (12) is used with the correct support plate (9 or
Flex side plates develop a wear pattern with the rotor and vanes and should not be
Set the rotor (16) on a flat wood strip with the arrow pointing right. Assemble the vane kit (15) vanes and inserts
into the rotor, in reverse order of disassembly. Make sure the sharp chamfer edge of each vane leads in the
direction of rotation. All vanes must move freely in the rotor slots with no evidence of binding.
Assemble the cam ring (14) over the rotor and vanes with the arrow pointing in the same direction as the rotor.
Lubricate the top surface of the rotor and vanes liberally with hydraulic fluid. Locate the scribe mark on the cam
ring (14) the outlet support plate (13), and the flex side plate (12).