Dodge Durango (DN) 1998-2003 Service Manual » Steering »

Power steering pump

Description and operation

Power steering pump

DESCRIPTION

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.

Trailer tow option vehicles are equipped with a power steering pump oil cooler. On the 5.2L and 5.9L the oil cooler is mounted to the engine block. On the 4.7L the oil cooler is mounted to the power steering pump.

NOTE: Power steering pumps are not interchangeable with pumps installed on other vehicles.

OPERATION

Hydraulic pressure is provided for the power steering gear by the belt driven power steering pump (Fig.

1) and (Fig. 2). The power steering pumps are constant flow rate and displacement, vane-type pumps.

Fig. 1 Power Steering Pump - 5.2L & 5.9L

1 - RESERVOIR CAP AND DIPSTICK

2 - RESERVOIR

Fig. 2 Power Steering Pump - 4.7L

1 - PUMP

2 - RESERVOIR

3 - PULLEY

Diagnosis and testing

Pump leakage

The pump is serviced as an assembly and should not be disassembled. Plastic pump reservoirs can be replace and the reservoir O-ring.

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

Service procedures

Power steering pump - initial operation

WARNING: THE FLUID LEVEL SHOULD BE CHECKED WITH ENGINE OFF TO PREVENT INJURY FROM MOVING COMPONENTS.

CAUTION: Use MOPAR Power Steering Fluid or equivalent. Do not use automatic transmission fluid and do not overfill.

Wipe filler cap clean, then check the fluid level.

The dipstick should indicate COLD when the fluid is at normal temperature.

(1) Turn steering wheel all the way to the left (2) Fill the pump fluid reservoir to the proper level and let the fluid settle for at least two (2) minutes.

(3) Raise the front wheels off the ground.

(4) Slowly turn the steering wheel lock-to-lock 20 times with the engine off while checking the fluid level.

NOTE: Vehicles with long return lines or oil coolers turn wheel 40 times.

(5) Start the engine. With the engine idling maintain the fluid level.

(6) Lower the front wheels and let the engine idle for two minutes.

(7) Turn the steering wheel in both direction and verify power assist and quiet operation of the pump.

If the fluid is extremely foamy or milky looking, allow the vehicle to stand a few minutes and repeat the procedure.

CAUTION: Do not run a vehicle with foamy fluid for an extended period. This may cause pump damage.

Removal and installation

Power steering pump - 5.2L & 5.9L

REMOVAL

(1) Remove the serpentine drive belt, refer to Group 7 Cooling.

(2) Clamp the fluid return hose and disconnect the hoses from the power steering pump. Cap the fittings.

(3) Remove battery ground cable and bracket bolts.

(4) Remove the pump assembly (Fig. 3).

(5) Remove the pump pulley, refer to Pump Pulley Removal. This will allow access to the pump attaching screws.

(6) Remove the pump bracket bolts (Fig. 4) and remove the bracket.

INSTALLATION

(1) Install the bracket on the pump and tighten bolts to 41 N*m (30 ft. lbs.).

(2) Install the pump pulley, refer to Pump Pulley Installation.

(3) Install pump assembly on the engine block and tighten the bolts to 41 N*m (30 ft. lbs.).

(4) Install the battery ground wire and tighten nut to 41 N*m (30 ft. lbs.).

(5) Connect the fluid hoses to the pump.

Fig. 3 Pump Assembly

1 - PUMP ASSEMBLY

2 - BOLTS

Fig. 4 Pump Mounting Bracket

1 - PULLEY

2 - PUMP BRACKET

3 - STEERING PUMP

4 - BOLT

(6) Install the serpentine drive belt refer to Group 7 Cooling.

(7) Fill the reservoir with power steering fluid, refer to Power Steering Pump Initial-Operation.

Power steering pump - 4.7L

REMOVAL

(1) Remove the serpentine drive belt, refer to Group 7 Cooling.

(2) Remove return hose from the pump reservoir and drain the pump.

(3) Remove power steering pressure switch connector and remove pressure line from the bottom of the pump.

(4) Remove the oil cooler mounting bolt from the pump bracket if equipped.

(5) Remove 3 pump mounting bolts (Fig. 5) through pulley access holes.

(6) Remove the pump from the left cylinder head.

Fig. 5 Power Steering Pump - 4.7L

1 - PUMP

2 - MOUNTING BOLTS

INSTALLATION

(1) Align the pump with the mounting holes in the left cylinder head.

(2) Install 3 pump mounting bolts through the pulley access holes. Tighten the bolts to 28 N*m (21 ft.

lbs.).

(3) Install the oil cooler to the pump bracket if equipped. Install the oil cooler mounting bolt.

(4) Install the pressure line and return hose to the pump. Tighten the pressure line to 35 N*m (25 ft.

lbs.).

(5) Install power steering pressure switch connector.

(6) Install the serpentine drive belt, refer to Group 7 Cooling.

(7) Fill the power steering pump and perform Power Steering Pump Initial Operation.

Disassembly and assembly

Pump pulley

DISASSEMBLY

(1) Remove pump assembly.

(2) Remove pulley from pump with Puller C-4333 (Fig. 6).

Fig. 6 Pulley Removal

1 - POWER STEERING PUMP DRIVE PULLEY

2 - SPECIAL TOOL C-4333

ASSEMBLY

(1) Replace pulley if bent, cracked, or loose.

(2) Install pulley on pump with Installer C-4063-B (Fig. 7) flush with the end of the shaft. Ensure the tool and pulley remain aligned with the pump shaft.

Fig. 7 Pulley Installation

1 - POWER STEERING PUMP DRIVE PULLEY

2 - SPECIAL TOOL C-4063-B

(3) Install pump assembly.

(4) With Serpentine Belts; Run engine until warm (5 min.) and note any belt chirp. If chirp exists, move pulley outward approximately 0.5 mm (0.020 in.). If noise increases, press on 1.0 mm (0.040 in.). Be careful that pulley does not contact mounting bolts.

Specifications

Torque chart

DESCRIPTION TORQUE

5.2L/5.9L Power Steering Pump

Pump Bracket Bolts . . . . . . . . 41 N*m (30 ft. lbs.)

Pump Mounting Bolts . . . . . . 41 N*m (30 ft. lbs.)

Flow Control Valve . . . . . . . . 75 N*m (55 ft. lbs.)

Pressure Line . . . . . . . . . . . . . 35 N*m (25 ft. lbs.)

4.7L Power Steering Pump

Pump Mounting Bolts . . . . . . 28 N*m (21 ft. lbs.)

Flow Control Valve . . . . . . . . 81 N*m (60 ft. lbs.)

Pressure Line . . . . . . . . . . . . . 35 N*m (25 ft. lbs.)