Power Steering Pump Noise (Relocate Power Steering Pump Reservoir)

Some customers may comment on a power steering (PS) pump whine during engine start up in cold ambient temperatures. Once the engine warms up, the noise should diminish.

The PS pump cavitates due to the length of the suction line and the heavy viscosity of the fluid in cold ambient temperatures.

The PS pump reservoir is currently mounted on the left rear corner of the cab. The pump is mounted on the right side of the engine. This mounting arrangement results in a suction line being too long. Relocate the PS pump reservoir to the right side of the vehicle using the procedure and parts listed below.

1. Tilt the cab. Refer to Cab Tilting in the General Information sub-section of the Service Information.
2. Place a container under the PS reservoir.
3. Remove the existing PS reservoir from the vehicle.

3.1.	Disconnect the inlet pipe from the reservoir.

3.2.	Disconnect the quick release outlet hose from the reservoir using J 42971.

3.3.	Remove the reservoir and mounting bracket from the cab support. Retain the bolts and washers for later use.

4. Remove the existing inlet and outlet pipe assembly from the vehicle.

4.1.	Remove the left mud flap.

4.2.	Remove the ground strap between the transmission and the frame.

4.3.	Remove the front exhaust pipe.

4.4.	Disconnect the assembly quick release inlet hose from the steering gear pipe at the side member bracket using J 42971.

4.5.	Disconnect the assembly outlet pipe from the steering gear pipe at the side member bracket.

4.6.	Remove the bolt, the nut and the washers from the clip securing the pipe to the LH side member. Retain the fasteners for later use.

4.7.	Disconnect the assembly inlet and outlet quick release hoses from the pump using J 42971.

Important: Do not discard the pipe bracket bolts and washers. These will be re-used for the new inlet and outlet pipe assembly.

4.8.	Remove the bolts and washers from the pipe brackets at the RH and LH sidemembers.

4.9.	From under the vehicle, remove the bolts and washers from the pipe brackets at the crossmember.

4.10.

Remove the inlet and outlet pipe assembly from the vehicle.




5. Install the new PS reservoir w/mounting bracket to the cab support on the right side of the vehicle. Use the bolts and washers removed earlier.
6. Install the new inlet and outlet pipe assembly to the vehicle.





7. Install the bolts and washers to the pipe brackets at the RH and LH sidemembers. Use the bolts and washers removed earlier.



8. From under the vehicle, install the bolts and washers to the pipe brackets at the crossmember. Use the bolts and washers removed earlier.



9. Connect the assembly quick release inlet hose to the steering gear pipe at the side member bracket.
10. Connect the assembly outlet hose to the steering gear pipe at the side member bracket.
11. Secure the hoses to the LH side member with a new clamp, P/N 15520428. Use the bolt, the nut and the washers removed earlier.
12. Connect the reservoir inlet hose of the pipe assembly to the reservoir.
13. Remove the existing inlet adapter from the PS pump and replace with a new adapter, P/N 15167378.
14. For 1999 vehicles, remove the existing outlet adapter from the PS pump and replace with a new adapter, P/N 15038990 (JE3) or P/N 15038991 (JE4).
15. Install the new PS gear inlet hose, P/N 15096804 to the pipe assembly and pump.
16. Install the new PS reservoir outlet hose to the reservoir and pump. Use either P/N 15096801 (JE3) or P/N 15096802 (JE4).
17. Secure the PS reservoir outlet hose to the right side cab support with clamp, P/N 02043150. Use a new bolt, P/N 11514766, new washers, P/N 15650962, and a new nut, P/N 11516071.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: