Disassembly; Inspection - Danfoss 51 Series Service Manual

Service Manual
J1, J2, J3, J4 Controls
34
Series 51 Hydraulic Proportional Controls Service Manual
Legend (continued)
Item
M150, M151
(160, 1250)
Item
M14
T4, T5, U6, U7
N34, M22
M23
M24
N84, N33

Disassembly

1. Remove PCOR lock nut (M14).
2. Remove and discard O-ring (M16).
3. Remove the adjuster (Z*).
4. Remove the spring (M18).
5. Remove the PCOR spool assembly (M20).
C
Caution
Do not remove the PCOR valve bushing (M21).
6. Using a 7/16 wrench, remove the pin/plugs (N84) or (N33).
7. Remove and discard the O-rings (N84A) or (N33A).
8. Using a 1/8 internal hex wrench, remove 15 plugs (M24).
9. Remove and discard O-rings (M24A).
10. Using a 1/4 internal hex wrench, remove plugs (M22, N34).
11. Remove and discard O-rings (M22A, N34A).
12. Remove spool (N32).
13. Using a 3/8 internal hex, remove plug (M23). Discard O-rings (M23A).
14. Remove screws (M150 and M151) using a:
•
8mm internal hex wrench for 80 cc and 110cc motors
•
10 mm internal hex wrench for 160cc and 250cc motors
15. Remove the control assembly from the end cap.
16. Remove the 4-way valve assembly (F32).
C
Caution
Read Series 51 and 51-1 Bent Axis Motors Service Manual 11008567 for minor repair instructions for the
4-way valve, threshold spring, and ramp spring components, if repair is necessary.
17. Remove and discard O-rings (F324).
18. Remove and discard O-rings (G38), (G36) and (G42) or the gasket (N240).
19. Using a 3 mm internal hex, remove orifices (T4, T6, U6, U7).

Inspection

1. Inspect the housing for signs of corrosion or damage.
2. Discard any damaged parts.
11009446 • Rev BA • July 2014
Wrench size
10 mm internal hex
Wrench size
1 1/16
3 mm internal hex
1/4 internal hex
3/8 internal hex
1/8 internal hex
7/16 internal hex
Torque
110 Nm [81 lbf•ft]
Torque
54 Nm [40 lbf•ft]
3.7 Nm [2.7 lbf•ft]
37 Nm [27 lbf•ft]
95 Nm [70 lbf•ft]
6 Nm [4.5 lbf•ft]
12 Nm [9 lbf•ft]