HYDRAULIC FILTER CARTRIDGES.

b. Installation. Reverse procedures in a. above

(5) Pull or drive pins (20, 21) from cylinder

using new O-ring packing. Operate hoist control valve

ends. Be careful not to let cylinder fall as pins are

several times to purge air and check for hydraulic fluid

removed.

leakage at fittings. Tighten as required.

Installation.

6-70. STEERING WHEEL

(1) Position tilt cylinder (back end) In U-

a. Removal.

shaped bracket on truck frame.

(1) Remove horn button (para. 6-49).

(2) Align bracket holes and cylinder end hole.

(2) Remove steering wheel nut (20, figure 7-

Secure pin with screw.

33) and using a suitable puller, remove steering wheel

(3) Remove plugs from ports and caps from

(19) from steering gear column.

hoses and connect hydraulic hoses to cylinders.

(4) Check hydraulic fluid level in reservoir

b. Installation. Reverse procedures in a. above

(para 5-10).

orienting steering wheel on steering gear column so that

(5) After installation, operate tilt control lever

keyway properly mates with key before securing steering

several times to purge air from cylinders.

check

wheel with nut.

cylinders and hose fittings for leakage while operating.

(6) Secure front end of tilt cylinders to upright

6-71.

STEERING GEAR.

brackets with pins and attaching screws.

a. Lash adjustment.

(1) Remove nut holding drag link tie rod end (5,

6-67.

HYDRAULIC FILTER CARTRIDGES.

figure 7-30) to pitman arm and disconnect drag link.

6-68.

Two filters are used in the hydraulic system;

NOTE

one in suction line adjacent to pump, the other in return

line from control valve at left rear of hydraulic tank.

If necessary use puller but do not damage

a. Return Filter Cartridge Replacement.

threads or place strain on pitman arm.

(1) Unscrew cartridge filter element (7, figure

7-21) from filter head (8).

(2)

Remove horn button (para 6-49).

(2) Install new cartridge by reversing

(3)

Adjust steering gear lash (para 6-168).

procedure in (1) above. Wet sealing ring with clean

hydraulic oil and tighten hand-tight.

Steering Linkage Adjustment.

(1) With steering wheel halfway between

Suction Filter Element Replacement.

extreme tight and extreme left turn, assemble pitman

(1) Unscrew filter housing (1, figure 7-19)

arm (22, figure 7-33) to steering gear in vertical position.

from head (5) and discard housing seal (2).

(2) With trailing axle wheels in straight ahead

(2) Remove and discard filter element (3) and

position, adjust drag link (7, figure 7-30) to proper length

element seat (4).

by loosening clamps (6) and turning drag link tubing until

the rod end at front of drag link will enter hole in pitman

(3) Install new filter element and seals by

arm freely, with pitman arm vertical.

reversing procedures (1) and (2) above.

(3)

Tighten drag link clamps(6).

6-69.

HOIST REGULATING VALVE (Dual Mast

Truck).

6-72.

WHEEL

ALIGNMENT

MEASUREMENT.

Removal.

Determine if wheel alignment adjustment is needed as

(1) Fully lower lift carriage.

follows:

a. With rear axle level front to rear, and wheels in

(2) While working from front of truck, unscrew

straight ahead position, measure inside span between

hose from hoist regulating valve elbow (7, figure 7-23)

tires at hub height at front of axle. Mark point of

and cap to exclude dirt.

measurement.

(3) Unscrew hoist regulating valve (8) with

b. Roll truck until rear wheel rotates one-half

attached fittings from hoist cylinder and remove fittings.

revolution. Measure between same points except this

Discard O-ring packings.

time at rear of axle.

6-23