HYDRAULIC SYSTEM. - TM-55-4920-373-14-P0086

TM 55-4920-373-14&P

a. Place identification marking or tag on

b. Remove from each set of studs the elec-

each section of tubing or hose to be removed.

trical wiring and mark wires in order of removal.

b. Disconnect coupling using appropriate

c. Remove three screws from meter mount-

size wrenches.

ing flange and push gage. Handle ammeter

carefully.

c. Fittings are removed with an appropriate

sized wrench after removing or disconnecting

d. Replace ammeter with a known functional

hose or tubing.

and calibrated ammeter.

CAUTION

4. Reservoir Fluid Level Indicator. To re-

Care should be exercised during these

move the reservoir fluid level indicator (item 12,

procedures to avoid bending or denting

figure 2-1) proceed as follows:

tubes.

a. Remove three nuts from rear of reser-

2. Hydraulic Pump. To remove the hydraulic

voir level indicator studs.

pump (item 5, figure 4-3) it will be necessary to

b. Remove each set of wires from studs

first remove the hydraulic fluid reservoir. Refer

marking each set of wires and stud.

to step 3 below and proceed as follows:

c. Remove three screws from gage mounting

a. Remove tubing, hoses, and fittings from

flange and push gage from panel. Handle gage

the pump as required.

carefully.

b. Note attitude of pump mounting. It is

d. Replace gage with a known good calibrat-

turned 15 to a level plane. Mark pump housing,

ed gage.

mounting bracket, and engine housing to insure

proper orientation during installation.

5. Fuel Level Gage. To remove the fuel level

gage (item 7, figure 2-1) proceed with instructions

c . Remove pressure compensator control

given for reservoir fluid level indicator paragraph

knob and insert screw with same thread size into

4-11, step 4.

compensator tubing to restrain plunger and ball

bearings.

6. Electrical Wiring Cables. To remove the

electrical wiring/cables proceed as follows:

d. Remove volume control wheel and lock-

ing device.

a. For electrical leads that are not within

a laced or taped harness, disconnect the lead from

Remove necessary hydraulic tubing so

each end and mark each lead.

pump may be moved forward.

b. For electrical wires that

are laced or

f. Remove flow indicator assembly from

taped within a harness, disconnect

both ends of

pump.

the wire and cut one or both ends

free from con-

g. Remove coupling cover by removing

nection or soldered wire (refer to

step c).

snap ring on engine side of coupling and slide

c. If lead to be removed cannot be snaked

cover over engine shaft to unmesh gears.

out of harness let old wire remain in harness.

h. Remove four bolts securing pump to

bracket and list pump off chassis.

7. Starter/Ignition Switch. To remove the

starter/ignition switch (item 5, figure 2-2)

i. If pump is defective, replace with known

proceed as follows:

functioning pump.

a. For either switch remove the lugs from

3. Hydraulic Fluid Reservoir. To remove the

the switch terminals marking wire(s) and terminal

hydraulic fluid reservoir (item 1, figure 4-3)

as they are disconnected.

proceed as follows:

b. With a wrench back off the hex nut and

a. Release 8 quick disconnect fasteners (2

washer located at the rear of the panel.

on each of four sides) to release cabinet assembly

from trailer frame.

c. Remove the knurled round nut located on

the front of the control panel.

b. Lift cabinet assembly off of trailer frame.

d. Pull out the switch from the control

c. Disconnect fluid outlet line from

panel and replace with a new one.

reservoir.

4-12. HYDRAULIC SYSTEM. To remove com-

d. Remove nuts and lockwashers from four

ponents of the hydraulic system, first drain

mounting bolts.

hydraulic fluid (Chapter 3, Section I, paragraph

e . Remove reservoir.

3-12) and proceed as follows:

f. Repair or replace reservoir as

1. Tubing, Hoses, and Fittings. To remove

required.

tubing, hoses and fittings, proceed as follows:

4-21