Ls And Pc Controls - Danfoss 45 J Series Service Manual

Service Manual
Minor Repair (continued)

LS and PC Controls

Series 45 J Frame Open Circuit Axial Piston Pumps
Disassembly
1. Remove the 4 screws (C300) holding the
control housing onto the end cap.
2. Remove the control and discard the 4
interface O-rings (C200).
3. Remove the PC set screw (C102), PC adjusting
plug (C138), O-ring (C138A), springs (C134,
C135), and seat (C133). Discard the O-ring.
4. Remove the plug (C103), O-ring (C103A), and
PC spool (C132) from the control housing.
Discard the O-ring. Note orientation of the
spool for reassembly.
For PC only controls, skip steps 5 through 7
5. Remove the plug (C105) and O-ring (C105A),
or the plug (C106) and O-ring (C106A). Discard
the O-ring (C105A or C106A).
6. Remove the LS set screw (C102), LS adjusting
plug (C118), O-ring (C118A), back-up rings
(C118B), springs (C114, C115), and seat (C113).
Discard the C118A O-ring.
7. Remove the C104 plug, C104A O-ring, and
C112 LS spool from the control housing;
discard the O-ring. Note orientation of the
spool for reassembly.
Inspection
8. Inspect the adjusting plugs for wear at the tips and where they contact the springs; replace as
necessary.
9. Inspect the springs and spring guides for wear or damage; replace as necessary.
10. 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.
11. Inspect the control housing for damage. Check the spool bores for excessive wear.
12. Clean all parts and lubricate spools, springs, guides and new O-rings with clean hydraulic fluid.
520L0607 • Rev AI • Sep 2013
Control assembly
C104
3
/ inch
16
10.8 - 13.5 N•m
[8 - 10 lbf•ft]
C104A
C112
C105A
C106A
C106
3
/ inch
16
10.8 - 13.5 N•m
C200
[8 - 10 lbf•ft]
C133
C113
C135
C115
C114
C134
C118B
C138A
C118A
C138
C118B
C118
LS control shown; parts C104 through C106 and
C112 through C118 are not used on PC control
C103
3
/ inch
16
10.8 - 13.5 N•m
[8 - 10 lbf•ft]
C103A
C132
C105
3
/ inch
16
10.8 - 13.5 N•m
[8 - 10 lbf•ft]
C102
6 mm
7.5 - 10.8 N•m
[5.5 - 8 lbf•ft]
C300
4 mm
5.4 - 7.5 N•m
[4 - 5.5 lbf•ft]
E101 226
25