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Figure 4-34. Seat assembly, exploded view.
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TM-10-3930-631-12 Truck Lift Fork EMD Solid Rubber Tired Wheels 4 000 Lbs Capacity 144 and 180 In Lift Army Model MHE 227 Manual
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Figure 4-35. Hydraulic system, schematic diagram.
TM 10-3930-631-12
(2) Install seat cushion (6) and secure with
(2)  Refer to paragraph 4-31 and connect
screws (5).
seat brake linkage to brake link.
(3) Install back cushion (4) on frame and
(3) Install seat assembly (12) on plate and
secure with screws (1), washer (2) and nuts (3).
secure with lock nuts (1) and washers (2).
d. Installation.
(4) Refer to paragraph 4-31 and adjust seat
brake linkage if necessary.
(1) Install plate (4, fig. 4-33) on frame and
(5) Refer to paragraph 4-24 and install and
install shaft (10) through plate and brake link (11).
connect taillight on rear of seat.
Secure shaft with retaining rings (9).
Section XIII. AXLE ASSEMBLIES
Oil should be to level of plug hole.  Add lubricant as
4-47. General
required. Install plug.
a. The front or driving axle is connected to the
d. The drain plug is located at the bottom of the
drive motor shaft. The shaft drives the differential in the
differential housing. Remove level plug. Place a suitable
center of the axle. Torque is transmitted to the axles or
container beneath axle, remove plug, and drain lubricant.
jackshafts. The pinion on the axle is meshed with a ring
Install plug and tighten securely. Fill differential through
or bull gear in the wheel assembly. Rotation of the axles
level plug opening to level of hole. Install level plug.
rotates the wheels providing motive power from the
e. Lubrication of axle pinion and ring or bull gear is
truck.
accomplished by removing the front wheel.  Refer to
b.  The rear or steering axle is mounted on
paragraph 4-37 and remove the front wheels. Clean the
brackets at the front and rear. The spindles pivot on king
pinion and ring or bull gears with solvent and dry
pins and are actuated by the tie rods extending from a
thoroughly with compressed air.  Lubricate gears with
pivot arm mounted at the center of the axle. A power
grease (GAA). Fill gear spaces to three-fourths height of
steering unit, controlled by the steering wheel, rotates the
teeth with grease. Install front wheels. Check ring or bull
pivot arm, through the steering cylinder drag link, in the
gear mounting screws for tighteness.
Tighten if
direction required to turn the wheels.
necessary.
4-48. Front Axle
4-49. Rear Axle
a.  Service points on the front axle include the
a. The rear, or steering axle, requires very little
breather and drain and level plugs.
service. Lubricate according to the lubrication order.
b. The breather is located on the right top of the
b. Check tie rods, axle, steering cylinder and drag
differential housing.  Remove breather and clean with
link for damage.
cleaning compound, solvent (Fed. Spec. P-D-680) and
c. Check steering action and adjust if necessary
dry thoroughly. Install breather and tighten securely.
c. The level plug is located at the right front of the
axle housing. Remove plug and check level of lubricant.
Section XIV. HYDRAULIC LIFT COMPONENTS
tilt the mast and side shift the carriage.
4-50. General
b.  The main components of the hydraulic lift
a.  Power to raise, lower and tilt the mast and
system as illustrated on figure 4-35 are the hydraulic oil
carriage is supplied by the hydraulic system (fig. 4-35).
reservoir, motor-driven dual hydraulic pump, control
The carriage can be shifted from side to side
valve, filter, lift, tilt and side shift cylinders and hoses and
hydraulically. Included in the system is a power steering
tubes.
pump and motor, valve and cylinder to steer the lift truck.
c.  Power steering components consist of the
Hydraulic oil is stored in the reservoir and pumped by the
motor-driven single pump, steering unit valve and
hydraulic pumps to the control valve and steering unit.
steering cylinder.  Oil for the steering system is also
Manipulation of the control valve levers opens and closes
supplied by the hydraulic reservoir.
ports to various cylinders providing the motion to lift and
4-42

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