Adjustment on bench.

should be coated with a suitable nondrying, oil-resistant

wheel back exactly half the number of turns to the center

sealing compound. This is to prevent leakage of gear

position and mark the wheel at the top or bottom with a

lubricant from the steering gear assembly.

The

piece of tape.

compound should not be applied to female threads and

extreme care should be exercised in applying this

(5) Turn the sector lash adjuster screw clockwise to

compound to the bearing adjuster, as the compound

remove all lash between rack and sector teeth. Tighten

must be kept away from the bearing race.

the locknut.

(1) Place the lower roller bearing in place in the

NOTE

housing, then, place the worm shaft and nut assembly

into the housing.

Be sure adjustment is not changed while

tightening the locknut.

(2) Install the upper roller bearing and install the

adjuster into the housing.

(6) Using pull scale, check the pull at the rim of the

steering wheel. Take the highest reading on the scale as

(3) Assemble the lash adjuster with shim in the slot

the wheel is pulled through the center position. This

in the end of the sector shaft. Check the end clearance,

should be between 2-3/4 and 3-1/4 pounds.

which should not be greater than 0. 002 inch. For the

purpose of adjusting this end clearance a steering gear

(7) If necessary, readjust the lash adjuster screw to

lash adjuster shim unit is available. It contains four

obtain the proper pull. Tighten the locknut to 10 to 15 ft.

shims: 0. 063 inch, 0. 065 inch, 0. 067 inch and 0. 069

lbs. torque and again check the pull.

inch thick.

(8) Fill the assembly with gear lubricant to the level of

(4) After the lash adjuster end clearance has been

the filler plug hole and replace filler plug.

adjusted, start the sector shaft pilot into the bushing in

the side cover. Then, using a screwdriver through the

m. Installation. Reverse a. above.

hole in the cover, turn the lash adjuster in a

counterclockwise direction to pull the sector shaft pilot

6-25. STEERING CYLINDER.

into its bushing as far as it will go.

a. Removal.

(5) Rotate the worm shaft by hand until the ball nut is

about in the center of travel. This is to make sure that

(1) Disconnect, cap and tag hoses at cylinder.

the rack and sector will engage properly with the center

tooth of the sector entering the center tooth space of the

(2) Remove hose clamp holding hoses to cylinder,

nut.

disconnect drag link end at cylinder (Figure 6-12).

(6) Place a new gasket on side cover, then push the

(3) Remove cotter pins and nuts attaching front and

side cover assembly, including sector shaft, into place.

rear ends of cylinder to truck and remove cylinder.

After making sure there is some lash between the rack

and sector teeth, assemble and tighten the side cover

b. Control valve disassembly (see Figure 6-13). Do not

bolts.

disassemble a unit further than is necessary to correct a

malfunction.

During disassembly, special attention

(7) Turn in on the thrust bearing adjuster until the

should be given to identification of parts for proper

adjuster bottoms then back off 1/4 to 1/2 turn. Tighten

reassembly. Place all disassembled parts on a clean,

locknut.

lint-free surface for inspection. Carefully remove any

burs by light stoning with a medium India stone. Clean

1. Adjustment on bench.

all parts except packing and seals in a clean mineral oil

solvent. After drying thoroughly, lay the parts on a clean,

(1) Tighten the thrust bearing adjuster until all worm

lint-free surface. All internal oil passages of the unit

shaft and play has been removed. Then tighten the

must be thoroughly cleaned. All packing and seals

locknut.

should be replaced for reassembly. Soak them in

hydraulic fluid prior to being used. Refer to Figure 6-13

(2) Install the steering wheel on the worm shaft

and proceed with disassembly.

temporarily. Carefully turn the steering wheel all the way

in one direction and then turn back about one turn.

CAUTION

(3) Using pull scale, at right angles to one spoke at

Before removing unit or parts of unit to be

wheel rim, measure the pull required to keep the wheel

serviced, be certain the unit is not subject to

in motion. This should be between 1 and 1-1/2 pounds.

hydraulic pressure. Never use an air hose on

If necessary, adjust the thrust bearing adjuster until

or near the exposed parts because of the

proper pull is obtained.

presence of water and dirt in the air system.

(4) Turn the steering wheel from one stop all the way

to the other, counting the number of turns. Then turn the