Danfoss Series 45 Service Manual page 29

Service Manual
Series 45 Frame K and L Open Circuit Axial Piston Pumps
Minor repair
© Danfoss | August 2016
Inspection
1. Inspect the adjustment screws for wear at the tips and where they contact the springs; replace as
necessary
2. Inspect the springs and spring guides for wear or damage; replace as necessary.
3. Carefully inspect the spools. Ensure the sealing lands are free of nicks and scratches. Check the ends
that contact the spring guides for wear. Replace spools as necessary.
4. Inspect the control housing for damage. Check the spool bores for excessive wear.
5. Clean all parts and lubricate spools, springs, guides and new O-rings with clean hydraulic fluid.
Reassembly
1. Install the PC spool, spherical end first, into the PC bore. The PC spool is the shorter of the two. Using
a new O-ring, install the plug (C103). Torque to 11-14 N•m [8-10 lbf•ft].
2. Place the two PC springs onto the spring guide and install into the PC bore. Place a new O-ring onto
the PC adjustment screw and thread it into the PC bore until flush, then make another full turn. Install
and torque the set screw to 7-11 N•m [6-8 lbf•ft].
For PC only controls, skip steps 15 and 16.
3. Install the LS spool, spherical end first, into the LS bore. The LS spool is the longer of the two. Using a
new O-ring, install the plug (C106). Torque to 11-14 N•m [8-10 lbf•ft].
4. Place the two LS springs onto the spring guide and install into the LS bore. Place a new O-ring and
back-up rings onto the LS adjustment screw and thread it into the LS bore until flush, then make
another full turn. Install and torque the set screw to 7-11 N•m [6-8 lbf•ft].
5. Using a new O-ring, install the plug (C107). Torque to 11-14 N•m [8-10 lbf•ft].
6. Using petroleum jelly to retain them, install the three interface O-rings (C200) in the recesses on the
control housing.
7. Install the control assembly onto the endcap using the four screws (C300). Torque to 15-18 N•m
[11-13 lbf•ft]. Torque screws in a criss-cross pattern and re-torque the first screw to ensure proper
torque retention.
8. Check and adjust the control setting. See Adjustments.
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