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 TM 55-4920-373-14&P
a. Mount filter to test stand frame with 4
a. Insure that hex nut and external tooth
lockwasher are placed on switch shaft before in-
bolts and nuts.
serting switch shaft through control panel.
b. Connect hydraulic inlet and outlet lines.
b. Insert switch into control panel and place
the round knurled nut onto it so that the nut is
5. High Pressure Filter Assembly. To re-
flush with switch end of shaft.
place the high pressure filter assembly (item 4,
From the back side of the control panel
take up slack of the hex nut on switch shaft until
the switch is in proper vertical position and secure
a. Connect inlet and outlet hydraulic lines
until tight.
while supporting filter.
d. Reconnect the removed wires onto the
b. Connect switch and switch bypass lines.
switch terminals as marked and secure.
4-21. ENGINE. To replace engine components,
4-20. HYDRAULIC SYSTEM COMPONENTS. The
following procedures describe installation proce-
proceed as follows:
dures for hydraulic system components.
1. Crankcase and Components. To replace
1. Pump. To install the pump (item 5, figure
the crankcase and components (item 22, figure
NOTE
a. Attach engine mounts to crankcase
The hydraulic pump must be installed
assembly.
before installing the fluid reservoir.
b. Position crankcase assembly and engine
a. Position pump in chassis so that orienta-
mounts in place on the frame.
tion marks made during disassembly (paragraph
c. Attach engine mounts to frame.
b. Secure pump to chassis with four bolts.
2. Cylinder Block and Components. To re-
c. Slide coupling cover over pump shaft so
place the cylinder block and components (item 5,
gears mesh and secure with snap ring.
d. Install flow indicator on pump.
a. Install new gasket on crankcase
e. Connect all hydraulic tubing and fittings
assembly.
removed during disassembly (paragraph 4-12).
f. Replace volume control wheel and locking
b. Position cylinder block over studs on
device.
crankcase assembly.
g. Remove screw from compensator tubing
c. Fasten cylinder block to crankcase with
and install control knob.
nuts using standard torquing procedures.
2. Fluid Reservoir. To replace the fluid
reservoir (item 1, figure 4-3) proceed as follows:
d. Adjust valve tappets in cylinder block
so that in their lowest position, the intake valves
a. Position reservoir on mounting frame.
have a clearance of 0.008" and exhaust valves
b. Attach reservoir to frame with 4 bolts
have a clearance of 0.016".
and nuts.
3. Cylinder Head. To replace cylinder head
c. Connect hydraulic lines and level indi-
(item 3, figure 4-4), proceed as follows:
cator line.
3. Lines, Tubing, Fitting, Hose Assembly.
a. Install new gasket on cylinder block.
To attach lines, tubing, fitting and hose assem-
blies, proceed as follows:
b. Position cylinder head on block.
a. Select next line, tube, fitting or hose
according to identification tag attached during
c. Install mounting bolts and secure cylin-
disassembly.
der head using standard torquing procedures.
b. Install each component in the order
Torque bolts 25 to 32 foot pounds. Retorque
removed.
bolts when engine has warmed up.
4. Low Pressure Filter Assembly. To re-
To replace the governor (item
4. Governor.
place the low pressure filter assembly (item 7,
23, figure 4-4) proceed as follows:
4-31
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