Pump; Diagnosis And Testing - Pump Leakage; Standard Procedure - Power Steering Pump - Initial Operation - Mercedes-Benz 2005 Sprinter Service Manual

19 - 12

PUMP

PUMP
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

DIAGNOSIS AND TESTING - PUMP LEAKAGE

STANDARD PROCEDURE
STANDARD PROCEDURE - POWER
STEERING PUMP - INITIAL OPERATION . . . . 12
STANDARD PROCEDURE - FLUSHING
POWER STEERING SYSTEM . . . . . . . . . . . . 13
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 13
SPECIFICATIONS - TORQUE CHART
FLUID
STANDARD PROCEDURE
POWER STEERING PUMP FILL AND BLEED
PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . 14
PUMP
DESCRIPTION
CAUTION: Mopar ATF+4 Automatic Transmission
fluid or equivalent is to be used in the power steer-
ing system. No other power steering or automatic
transmission fluid is to be used in the system.
Damage may result to the power steering pump and
system if any other fluid is used, and do not over-
fill.
The pump is connected to the steering gear via the
pressure hose and the return hose. The pump shaft
has a pressed-on pulley that is belt driven by the
crankshaft pulley.
All vehicles are equipped with a power steering
fluid cooler.
NOTE: Power steering pumps are not interchange-
able with pumps installed on other vehicles.
OPERATION
Hydraulic pressure is provided for the power steer-
ing gear by the belt driven power steering pump. The
power steering pumps are constant flow rate and dis-
placement, vane-type pumps.
PUMP
TABLE OF CONTENTS
page
FLUID COOLER TUBE
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
INSTALLATION
. 12 HOSES
REMOVAL
REMOVAL - PRESSURE HOSE
REMOVAL - RETURN LINE FROM PUMP TO
COOLER TUBE . . . . . . . . . . . . . . . . . . . . . . . 15
REMOVAL - RETURN HOSE FROM GEAR
TO COOLER TUBE . . . . . . . . . . . . . . . . . . . . 15
INSTALLATION
. . . . . . . . 14 INSTALLATION - PRESSURE HOSE
INSTALLATION - RETURN LINE FROM
PUMP TO COOLER TUBE . . . . . . . . . . . . . . . 15
INSTALLATION - RETURN HOSE FROM
GEAR TO COOLER TUBE . . . . . . . . . . . . . . . 15
DIAGNOSIS AND TESTING - PUMP LEAKAGE
The pump is serviced as an assembly and should
not be disassembled. The plastic pump reservoir and
the reservoir o-rings can be replaced.
Check for leaks in the following areas:
• Pump shaft seal behind the pulley
• Pump to reservoir O-ring
• Reservoir cap
• Pressure and return lines
• Flow control valve fitting
STANDARD PROCEDURE
STANDARD PROCEDURE - POWER STEERING
PUMP - INITIAL OPERATION
WARNING:
CHECKED WITH ENGINE OFF TO PREVENT INJURY
FROM MOVING COMPONENTS.
CAUTION: Mopar ATF+4 Automatic Transmission
fluid or equivalent is to be used in the power steer-
ing system. No other power steering or automatic
transmission fluid is to be used in the system.
Damage may result to the power steering pump and
system if any other fluid is used, and do not over-
fill.
. . . . . . . . . . . . . . . . . . . . . . . . . 14
THE FLUID LEVEL
VA
page
. . . . . . . . . . . 15
. . . . . . . 15
SHOULD BE