Inspection; Assembly - Danfoss 51 Series Service Manual

Service Manual
D7, D8, DA, DC Controls
Series 51 Electrohydraulic Proportional Controls Service Manual
Legend (continued)
Item
M24, N84
Item
M22
M15
M18
M14
M23
Z*
5. Using a 13 mm wrench remove the Z* adjuster.
6. Remove spring (M18). Remove the PCOR spool (M20).
7. Don't remove PCOR valve bushing (M21).
8. Using a 1/8-inch internal hex wrench, remove plugs (M24).
9. Remove and discard O-rings (M24A).
10. If necessary, use a 3 mm internal hex wrench to remove and clean orifices T4, and T6.
11. Using a 1-inch wrench remove plug (M23). Remove and discard O-ring (M23A).
12. Using a 1/4-inch internal hex wrench remove plug (M22). Remove and discard O-ring (M22A).
13. Remove spool (N32).
14. Remove screws (M150 and M151). Refer to table for wrench sizes.
15. Remove control assembly from end cap.
16. Remove and discard O-rings (G36, G38, and G42) or gasket (G420).
17. Remove the 4-way valve assembly (F32). Discard O-rings (F324).
C
Caution
Read BLN-10181 for minor repair instructions for the F32 4-way valve, threshold spring, and ramp
spring components, if their repair is necessary

Inspection

1. Inspect the housing and spools for wear, damage or foreign material.
2. Check internal passages for contamination and clean them if necessary.

Assembly

1. Lubricate and install new O-rings (F324). Install 4-way valve assembly (F32)
2. Using a 3 mm internal hex wrench, install and torque orifices (T4, and T6) to 2.8 N•m [2.1 lbf•ft].
3. Using petroleum jelly to retain them, install the new O-rings (G36, G38, and G42) or gasket (G420).
4. Position control housing on endcap.
5. Install screws (M150 and M151). Refer to table for wrench sizes and torques.
6. Install spool (N32).
7. Lubricate and install new O-rings (M22A). Install plug (M22).
8. Using a 1/4-inch internal hex wrench, torque plug (M22) to 37 N•m [27 lbf•ft].
9. Lubricate and install a new O-ring (M23A). Install plug (M23).
10. Using a 1-inch wrench, torque plug (M23) to 40 N•m [30 lbf•ft].
11. Lubricate and install new O-rings (M24A). Install plugs (M24).
11009448 • Rev BA • July 2014
Wrench size
1/8 internal hex
Wrench size
1/4 internal hex
3 mm internal hex
1/8 internal hex
1-1/16 inch
1 inch
13 mm
Torque
6 Nm [4 lbf•ft]
Torque
37 Nm [28 lbf•ft]
3.7 Nm [2.7 lbf•ft]
6 Nm [4.5 lbf•ft]
52 Nm [38 lbf•ft]
40Nm [30 lbf•ft]
N/A
27