Danfoss Control bias spring upgrade Installation guide

Service Kit Instructions

Series 42 Control bias spring upgrade

From

B016

D91

D032

(torque to 30-70 ft•lbs)

D91

D92

Removal of the control spool spring

1. Clean the external surfaces of the pump.

2. Remove the control spool bore plug (item B016) with a 5/16 in internal hex wrench.

3. Remove the control spool bias spring (item D91).

Installing the Upgrade Bias Spring

4. Assemble the spring guide to one end of the

upgrade spring (item D91).

5. Install the spring and guide assembly into the control spool bore noting proper orientation.

6. Install the new control spool bore plug (item

D92

D91

D032 (torque to 30-70 ft•lbs)

From

B016

D032) using a 7/8 in wrench and torque to [40-95 Nm (30-70 ft•lbf)].

7. Repeat the procedures 1 thru 6 on the second pump of the tandem unit.

Final Adjustments

8. If the control neutral needs adjustment, refer to BLN-10093 for proper procedure.

Spring Identification

Old Spring New Spring

Free Length 2.8 in 3.35 in

I.D. 0.495 in 0.433 in