SECTION 14: STEERING
PA1621 Maintenance Manual All Series | January 2017
21
7. Reinsert and tighten the dipstick.
13.3.1 Filter Element Replacement
1. Before taking off the power steering fluid
reservoir cover, thoroughly clean the
reservoir and its immediate vicinity to prevent
the ingress of impurities into the hydraulic
fluid.
2. Unscrew and remove the cover nut located on
top of the power steering fluid reservoir
(Figure 25).
3. Remove the reservoir cover and the gasket.
4. Remove the retaining spring, the element
retainer and finally the filter element.
5. Fit a new filter element.
6. Pass the reservoir threaded rod through the
element and install the element with the
element’s writing “THIS END UP” on top.
7. Pass the reservoir threaded rod through the
retainer and rest the retainer on top of the
element, followed by the compression spring.
8. Clean the large gasket and the mating
surfaces on the cover and reservoir.
9. Properly place the large gasket in the cover.
Install the cover, making sure the gasket is
properly placed.
10. Clean the small gasket and install with the
rubber side against the cover. Screw and
tighten the nut as necessary to prevent leaks.
13.4 STEERING SYSTEM PLAY
INSPECTION
Basically, the steering system play is checked
with the engine running and the front wheels in
the straight ahead driving position. The steering
wheel is slowly turned in one direction until there
is a perceptible movement of a front wheel. If a
point on the steering wheel rim moves more than
the value indicated below before perceptible
return movement of the wheel under observation,
there is excessive free play in the steering
system.
Steering wheel travel covered:
Maximum 1.732 inch (44mm) with Prevost
18-inch steering wheel
NOTE
The full procedure is described under
paragraph 1.6.7 Checking the Steering Gear
Play in ZF SERVOCOM DESIGN,
OPERATION, MAINTENANCE, INSPECTION
(8090) manual.
Take note that the maximum travel covered
value specified in ZF’s manual doesn’t apply
to the Prevost design which uses a 18-inch
steering wheel.
If the maximum value is exceeded, the steering
system should be thoroughly inspected for worn
or loose components, beginning with the steering
linkage. If the steering linkage is in good
condition, then the steering column and the
steering gear should be inspected.
MAINTENANCE
I-BEAM FRONT AXLE
Perform the steering play inspection every 185
000 miles (300 000 km) or once a year
whichever comes first.
MAINTENANCE
INDEPENDENT FRONT SUSPENSION
(Private use only)
Perform the steering play inspection every 48
months.
13.5 STEERING STABILIZER CYLINDER
(DAMPER)
The steering damper is located on R.H. side, aft of
front axle (Figure 26).
The cylinder is non-adjustable and non-repairable.
Check for oil leaks or lack of resistance.
Disconnect the cylinder from axle, and then
carefully attempt to extend and collapse it
manually.
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