Bleeding Power Steering Hydraulic System; Hydraulic Pressure Test; Power Steering Hydraulic Pump; Description - PREVOST H3-41 Maintenance Manual

5. BLEEDING
HYDRAULIC SYSTEM
To bleed the power steering hydraulic system,
refer to "RB Robert Bosch Servocom - Service
Manual (8090)", found
Publications USB flash drive, under heading
"Setting and Functional Test".
6.

HYDRAULIC PRESSURE TEST

Perform a pressure test as outlined in the "ZF-
SERVOCOM Repair Manual" annexed to this
section under heading "Setting and Functional
Test".
NOTE
For vehicles equipped
SERVOCOMTRONIC (speed sensitive) unit,
refer to the supplement to the repair manual ZF-
SERVOCOM.
7.

POWER STEERING HYDRAULIC PUMP

7.1

DESCRIPTION

The power steering pump is a gear driven
hydraulic unit which supplies hydraulic pressure
for the operation of the steering gear. The pump is
mounted on the engine, at the flywheel end and is
also used for driving the fuel pump.
7.2

REMOVAL AND INSTALLATION

The pump is accessible through the engine
compartment R.H. access door.
To remove the pump, proceed as follows:
1. You must first remove the fuel feed pump.
2. Clean around the fuel pump and fuel lines.
Position a container to catch any fuel that
might drain from the pump or lines.
3. Remove the fuel pump.
NOTE
Only unfasten the bolts marked with arrows.
POWER STEERING
on your Technical
with ZF-
PA1621 Maintenance Manual All Series | Section revised June 2019
SECTION 14: STEERING
FIGURE 6: FUEL PUMP REMOVAL
CAUTION
Ensure to clean around the head of the bolts.
Debris will prevent the tool from fitting properly
and cause damage to the fasteners.
4. Check that the adapter and fuel pump drive
axle are not damaged.
FIGURE 7: FUEL PUMP DRIVE AXLE
5. Set the fuel pump aside.
6. Clean around the power steering pump and
loosen the steering lines. Position a container
to catch any hydraulic fluid that might drain
from the pump or lines.
7. Unfasten the power steering pump bolts.
NOTE
Only unfasten the bolts marked with arrows.
11