Section VII. HYDRAULIC RESERVOIR

TM 10-3930-621-34

e. Replace defective parts as authorized.

e. Install screws (11 and 13), spacer (9), and lock

washers (10) in carriage supports.

f. Remove blocks and lower inner mast to floor

10-31. Assembly and Installation

using a suitable hoist.

a. Refer to figure 10-8 and assemble and install as

g. Using hoist, install backrest (1) on carriage

follows: b. Install same size and quantity of shims (5)and

frame (7) with lock washers (2) and screws (3).

6) as found in disassembly. Install bearings (4).

h. Operate mast assembly and check carriage

c. Using hoist, raise and lower carriage frame

movement for side play and binding. If necessary,

assembly in inner mast channels several times to check

remove carriage and backrest assembly again and

for free movement throughout entire range of travel. If

reshim. Alinement of inner mast channels and bearings

bearings bind, reshim to 0.015 of an inch clearance

should also be checked, if a second removal is

between bearings and mast channel.

necessary.

Note. Divide shims as equally as possible between

i. Lower carriage to lowest point of travel, check

bearings. Shims are available in 0.015 and 0.C40 inch

distance from lower horizontal fork support to floor.

thicknesses.

Distance should be adjusted within the 234 to 31/4 inch

d. When carriage frame moves freely within

range. Refer to TM 10-3930-621-12 for adjustment

clearance specified, secure chains with anchor pins to

procedure.

frame. Before releasing hoist, check that chains are

j. Install and lock carriage forks.

secure at cylinder cluster and running evenly, with no

twists,

through

the

crosshead

bearings.

Section VII. HYDRAULIC RESERVOIR

h. Remove short screws (7), lock washers (9), flat

10-32. Description

washers (8), bushings (10), and nuts (11) attaching

A hydraulic reservoir, located under the floor plate in the

reservoir to mounting plate near front wheel.

driver's compartment, contains sufficient oil for the entire

i. Remove long screws (6), lock washers (9), flat

hydraulic and power steering systems. The tank is of

washers (8), bushings (10), and nuts (11) attaching

welded construction. Oil is added through a gage

reservoir to rear crossmember of frame.

opening and measured on a screened gage installed in

i. Slowly lower and remove reservoir (1).

the tube. The reservoir is drained through a pipe plug

installed in a cover at the bottom of the tank. Oil is

10-34. Cleaning and Inspection

withdrawn by the pump and returned from the control

valve through tubing connected at diagonal corners of

a. Flush reservoir (1) with cleaning compound,

the tank. Hydraulic oil is returned to the tank from the

solvent (Spec.

P-S-661).

Dry thoroughly with

power steering gear through a coupling at the bottom of

compressed air.

the tank.

b. Inspect tank for rust, cracked seams or

damaged threads.

c. Clean breather and gage screen with reverse

10-33. Removal

flow of hydraulic fluid or compressed air.

a. Refer to figure 10-10 and remove as follows:

d. Inspect all parts for damage and replace as

b. Remove floor plates (TM 10-3930-621-12).

authorized.

Drain reservoir and remove breather (2), gage (3), and

e. Replace packing.

screen (4) from top of reservoir (1).

c. Disconnect suction and return hydraulic lines on

10-35. Repair

top of reservoir (1).

d. Lift front end of truck and block in position to

a. If damage is such that repair by welding is

permit reservoir to be removed.

possible, flush tank thoroughly to remove all traces of

e. Disconnect power steering hydraulic return line

explosive solvents, both liquid and vapor.

at elbow (5) and allow line to drain. Remove elbow (5)

from tank.

Note. Reservoir must be thoroughly cleaned and

f. Remove nuts (14), cover (13), and packing (15)

flushed after repair.

from bottom of reservoir (1). Discard packing.

b. If damage is beyond reasonable welding repair,

g. Block reservoir (1) to support during removal.

replace tank as authorized.

10-19