MANUAL.LM20 Revision C January 2023 Page 26 of 52
should be sandwiched between the hydraulic cylinder and the isolator). It is recommended that
the bolts be tightened in an X pattern. It is also recommended if available, to place a level on the
isolator to insure proper installation.
2. Always lubricate all threaded components and metal to metal contact surfaces with Never-Seez.
Failure to lubricate parts may result in galling of components. Inspect the external and if using
liquid quench, internal O-rings. If scratches or cuts appear, replace the O-rings and lubricate them
with tri clover spray or an equivalent lubricant.
3. Install the bearing isolator into the isolator. If necessary insert the two #10-32 x2" long screws
into the bearing isolator. As you insert the bearing isolator the screws should be facing you. Push
the bearing isolator until it will not move any further. Remove the two screws.
4.1.8 Install New Plunger Seal and Back-Up Ring
1. Make certain the pump body is clean of debris or material. Obtain a new plunger seal and back
up ring and lubricate them with a compatible lubricant such as tri clover spray.
2. Insert the new seal by hand into the pump body, open end of seal first. Refer to the pump
assembly drawing.
3. Insert the back-up ring on top of the seal. Press the back-up ring until it sits flat touching the seal.
Make certain the seal and back up ring are pressed firmly into the pump body and are sitting
square. The seal and back up ring must not be sitting at an angle. Do not proceed until the seal
and back up ring are properly installed.
4.1.9 Install the Bearing and Bearing Retainer
1. Place the pump body in a vise. Wrap the pump body in a rag or cloth to protect it.
2. Insert a new bearing into the bearing retainer. Make sure the bearing sits locked into the retainer
cavity.
3. Lubricate the bearing retainer’s threads with Never-Seez.
4. Carefully screw the bearing retainer into the pump body. The bearing retainer should easily screw
into the pump body. If resistance is felt unscrew the bearing retainer, inspect its threads and the
pump body threads for any debris or burrs. Do not force the bearing retainer in and be careful not
to cross thread the components.
5. Using the bearing retainer removal tool, insert the dowel pins into the bearing retainer slots and
rotate the tool in a clockwise direction. Tighten the bearing retainer to 55-60 ft.lbs. Do not strike
the removal tool with a hammer.
4.1.10 Install the Pump Body
Apply a light coating of Never-Seez to the pump body threads.
1. With the plunger fully retracted, take the pump body with O-ring and 2.75" diameter locknut
attached and carefully rotate the pump body in a clockwise direction into the isolator. Be careful
not to cross thread the components. If resistance is felt, unscrew the pump body and inspect the
pump body threads and the isolator threads for debris or burrs. The pump body should rotate
smoothly. Screw the pump body into the isolator until it bottoms out. Back off the pump body
approximately 1/8 turn so that its inlet opening is vertical.
2. Rotate the 2.75" diameter locknut by hand until it is snug against the isolator.
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