Danfoss Control bias spring upgrade Installation guide

Service Kit Instructions

Series 42

Control bias spring upgrade

From		To
	D
	B016	D032
		(torque to 30-70 ft•lbs)
	D91	D91
		D92

Removal of the control spool spring

To
D92
D91	From
D91
D
B016
D032
(torque to 30-70 ft•lbs)

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 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

© Danfoss, 2013

BLN-10158 • Rev AA • September 2013

1