Assembly-continued -706880896

TM 5-4210-233-14&P-1

5-39. STEERING GEAR-Continued

NOTE

Bearing BR-970 requires 41 rolls, and Bearing BR-970-1

requires 42 rolls.

The bearing assembly (16) may be of caging (retained) roll

type therefore not requiring reassembly of the rolls.

(3) Install the new rack piston backup O-ring (53) and the new Teflon rack piston seal ring (47) into the

rack piston (46) ring groove. Do not over stretch the rings as you install them. Coat with a liberal

amount of grease.

WARNING

During step (4), you should wear eye protection, as the spring

loaded poppets could eject, and cause eye injury.

(4) If the poppets were removed, position rack piston (46) in a soft jawed vise and install one poppet

seat (57). From the other end of the rack piston install one poppet (58), the spring (60), the nylon

spacer rod (59), the other poppet (58), and the other poppet seat (57). Torque both poppet seats to

20-25 ft. lbs. (27-34 Nm). Install both retaining rings (56).

(5) When the 10 minute compression time has elapsed, remove the compression tool from the worm

shaft/input shaft assembly (1). Grease the worm shaft seal ring and the sealing surface inside the

rack piston (46). Install the worm shaft/input shaft assembly into the rack piston end that will

position the worm seal ring in the rack bore and the worm ball track grooves to accept the set of

balls through the rack piston ball guide holes.

NOTE

If your ball return guides do not have a hole in the top for

loading balls, then proceed to step (8). If your ball return guides

do have a hole in the top, then follow steps (6 & 7).

WARNING

Do not seat guides with a hammer. Damage to guides can

result in subsequent lock-up or loss of steering, which could

cause an accident.

(6) Assemble the ball return guides (51) into the rack piston (46). Make sure that the ball return guides

are seated.

WARNING

Make sure the ball return guides stay down in place while you

assemble the balls. Failure to hold the guides down may result

in a ball being trapped outside the closed loop. A trapped ball

can result in a steering lockup, which could cause an accident.

5-226