Checking and Adjusting Friction Torque of Steering Gear

Checking and Adjusting Friction Torque of Steering Gear

- Remove steering gear from vehicle.

Removing and Installing Parameter Steering (PML) P-Valve (Y10)




- Mount gear on assembly support 140 589 00 59 00 with two screws and clamp in the vise.




- Measure Total Friction Torque at steering shaft with friction torquemeter 123 589 02 21 O0 and wrench socket insert 123 589 00 O8 00 by slowly turning the steering shaft from stop to stop several times.







- Slacken lock nut (50). Turn adjusting screw (45) 1/4 turn in stages.
- direction "a" = increases friction torque
- direction "b" = reduces friction torque
Tighten collar nut to 60-65 Nm, holding adjusting screw (45) tight.
- Recheck total friction torque after tightening collar nut. Observe notes





The friction torque in the center area should be 30-60 Ncm above the previously measured basic friction torque.

Example:
Friction torque of steering gear after setting
Basic friction torque 60 Ncm
Increase in center area 30-60 Ncm
Total friction torque 90-120 Ncm

Set value:
When the steering shaft is over the center position the total friction torque should be:
New steering 110-150 Ncm
Used steering 100-129 Ncm

Notes:
The steering gears are equipped with play compensation. However, this only acts in the center range of the steering gear. An adjustment can therefore only be carried out noting the following points:
1. Do not adjust friction moment above the specified value.
2. When turning the steering gear no high spots should be detected after adjustment.
3. The steering must self-center correctly when driving straight ahead on a test drive.




On steering gears 765.900 (model 201 up to vehicle chassis end no. A 084024) the clamping bush (83) must be detached to adjust the friction moment. After adjusting the friction moment, push the clamping bush (83) onto the steering shaft so that both surfaces are parallel to the mounting points of the steering gear and the milled section points towards the pitman arm (arrow).
Push on support ring (84) and tighten the nut (85) to 50 Nm.




On steering gears 765.922 and 765.950 (model 202), the sleeve (23j) with two surfaces be detached from the steering shaft.
After adjusting the friction moment first
- align the clamping slot of the sleeve (23j) of the marking notch of the steering shaft, then...
- push on sleeve (23j) up to the stop on the steering shaft and secure with new locking ring (23j).

Checking and Adjusting Friction Torque of Steering Gear: