Installation. - TM-10-3930-627-340089

f. Rack-Piston and Worm Assembly and Gear

until the side cover bottoms on the gearshaft, and back

off 1/2 turn.

Housing Assembly.

(6) Installation.

(1) Removal.

(a) Lubricate the new side cover packing (56)

(a) Remove housing end plug as outlined in

and install in the groove in the face of the side cover.

d. (1) above.

(b) Turn the stub shaft (20) as necessary until

(b) Remove rack-piston end plug as outlined

the middle rack groove is aligned with the center of the

in e. (1) above.

gearshaft needle bearing (27).

(2) above.

tooth in the sector meshes with the center groove of the

(d) Insert rack-piston arbor (see fig. 2-3 for

rack-piston nut (35). Make sure that the side cover

tool details) in end of worm (17, fig. 11-2). Rotate stub

packing is in place before pushing the side cover down

shaft to left turn, which will force rack-piston nut (35)

on the gear housing.

onto arbor and remove rack-piston nut from gear

(d) Install the side cover screws (54) and

housing, taking care to keep arbor in place in the rack-

tighten to 30 to 35 foot pounds.

piston nut or the balls will fall out. If rack-piston nut is

(e) Install lash adjuster nut (53) on lash

being removed to replace the piston ring (37) and back-

adjuster without tightening. Adjust gearshaft (refer to f.

up packing (36), reassemble without further

below). Hold lash adjuster from rotating with a hex key

disassembly.

wrench and tighten lash adjuster nut to 20 to 30 foot

(e) Remove valve as outlined in b. (2) above.

pounds.

(f) Remove worm, lower thrust bearing and

d. Housing End Plug.

races.

(1) Removal.

(2) Disassembly.

(a) Rotate end plug retainer ring (40, fig. 11-

(a) Cut piston ring (37) and packing (36)

2) so that one end of the ring is over the hole in the

back-up seal, remove from rack-piston nut (35) and

housing. Spring one end of ring with punch to allow

discard.

screwdriver to be inserted to lift ring out.

(b) Remove screws and lock washers (45)

(b) Do not rotate further than necessary, or

from rack-piston nut with screwdriver.

the balls from the rack and worm assembly will fall off

the end of the worm. Rotate stub shaft (20) with 3/4

(d) Place the assembly on a clean cloth and

inch box end or socket wrench to full left turn position

remove ball return guides (43) and arbor. Make sure all

and force end plug (39) out of housing.

of the balls (42) are caught on the cloth.

(3) In-process inspection.

packing (41).

(a) Inspect housing. If bore is badly scored or

(2) Installation.

worn, replace housing. If connectors (14 and 15) are

(a) Lubricate new housing end plug packing

badly dented or scored, replace them. To remove

(41) with automatic transmission fluid, Type "A", and

connectors, tap threads in connectors, using a 5/16-18

install in gear housing (46).

tap. Thread a screw with nut and flat washer attached

(b) Insert housing end plug (39) into gear

into tapped hole. To pull connector, hold screw from

housing and seat against packing.

rotating while turning nut off screw. This will pull

connector from gear housing. Discard connectors.

fingers. Install one end of ring and work ring into groove

(b) Inspect ball plug (26) in housing. If it is

until seated. Slight tapping may be required to securely

leaking or raised above housing surface, drive it in flush,

bottom retainer ring in gear housing.

to 1/16 inch below the surface. Tighten ball by staking

e. Rack-Piston End Plug.

the housing. If leakage cannot be stopped, housing

(1) Removal.

must be replaced.

(a) Remove housing end plug as outlined in

d. (1) above.

grooves for defects. If any defects are found, housing

(b) Remove rack-piston end plug (38, fig. 11-

must be replaced.

(d) At initial assembly, the rack-piston nut,

2) by inserting a 1/2 inch drive socket extension into the

square hole in the plug and turning counterclockwise.

worm and balls are selected to obtain a preload of to 4

(2) Installation.

inch pounds measured on center through an angle of 90

degrees. This preload may drop during service, without

(a) Turn plug into rack-piston and tighten to

having any noticeable effect on steering.

Upon

50 to 100 foot pounds.

complaint of loose or hard steering, thrust bearing

(b) Install housing end plug as outlined in d.

adjustment and overcenter adjustment will correct the

(2) above.

11-6