Contents: Disassembly ↓ Assembly ↓
Removal the bipod
1 – puller A.47043; 2 – steering knuckle shaft; 3 – bipod; 4 – bracket A.74076/R
Steering gear reducer parts
1 – crankcase; 2 – bipod; 3 – lower crankcase cover; 4 – adjusting shims; 5 – outer ring of worm shaft bearing; 6 – ball separator; 7 – bipod shaft; 8 – adjusting screw; 9 – adjustment plate; 10 – lock washer; 11 – worm shaft; 12 – Upper crankcase cover; 13 – sealing gasket; 14 – knuckle shaft sleeve; 15 – worm shaft seal; 16 – knuckle shaft seal
Control of the friction torque of the worm with a dynamometer
1 - worm; 2 – head A.95697/5; 3 – dynamometer 02.7812.9501; 4 – bracket for repair stand of steering gear housing; 5 – steering gear housing
Disassembly
1. Drain the oil from the steering gear housing. Fasten the housing to the bracket A.74076/R with the support A.74076/1.
2. Having unscrewed the nut securing the steering knuckle 2 (see fig. Steering gear reducer parts) and after removing the spring washer, remove the bipod using the A.47043 puller (see fig. Removing the bipod).
3. After unscrewing the mounting bolts, remove cover 12 (see fig. Steering gear reducer parts) steering gear housing together with adjusting screw 8, adjusting plate 9, lock washer 10 and lock nut.
4. Remove shaft 1 7 of the steering knuckle assembly with the roller from the crankcase.
5. After unscrewing the mounting bolts, remove cover 3 of the worm shaft thrust bearing together with adjusting linings 4.
6. Using worm shaft 11, push outer ring 5 of bearing out of crankcase and remove shaft together with bearing separators 6.
7. Remove the worm shaft seal 15 and the pitman shaft seal 16.
8. Device 3 (mandrel 67.7853.9541) press out the outer ring of the upper bearing 2 (1 – steering gear housing).
Assembly
1. Assemble the steering mechanism on bracket A.74076/R in the reverse order of disassembly.
2. Press the outer ring of the upper worm bearing with the 67.7853.9541 mandrel, moving the nozzle on the mandrel handle to the opposite side.
3. After installing the worm in the steering gear housing and securing the lower cover, check using the dynamometer 02.7812.9501 and the head A.95697/5 (see fig. Control of the friction torque of the worm with a dynamometer) friction moment of the worm shaft; it should be within the range of 19.6–49 N cm (2–5 kgf cm).
4. If the torque is less than specified, reduce the thickness of the adjusting shims 2; if more - increase (1 - bearing cap; 3 – worm).
5. After installing the bipod shaft, check for any gap in the engagement of the roller with the worm in the positions of the worm shaft turned to the right and left by 30° from the neutral position of the bipod.
6. Eliminate any possible gap in the engagement using adjusting screw 2 (see Fig. Section of the steering gear housing) and tighten lock nut 3.
7. After adjusting the clearance in the engagement of the roller and worm, check the friction torque of the worm shaft with a dynamometer, which should be equal to 88.2–117.8 N cm (9–12 kgf cm) when turning the worm shaft 30° both to the left and to the right from the middle position and should decrease smoothly to 68.6 N cm (7 kgf cm) when turning from an angle of 30° to the stop.
8. After completing the assembly, check the angles of rotation of the pitman arm from the neutral position, which should be 32°10'±1° both to the left and to the right until the pitman arm stops at the bolt heads, pour 0.215 l of TAD-17i transmission oil into the steering gear housing.