Inspection; Assembly - Danfoss 51 Series Service Manual

Service Manual
HZ, HA, HB, HE Controls
20
Series 51 Hydraulic Proportional Controls Service Manual
Legend
Item
M18
M12
M16
M22 (80, 110)
M22 (160, 1250)

Inspection

1. Inspect the housing and shuttle valve for damage or foreign material.
2. Check internal passages for contamination and clean them if necessary. If present, discard the 2
screens ( M14) (they are no longer necessary).

Assembly

1. If used, install the shuttle valve assembly (M10) (HZ controls only).
2. If used, install orifice (M12) using a 5 mm internal hex wrench (HZ controls only). Torque to 8 N•m [6
lbf•ft].
C
Caution
Overtorquing orifice (M12) may crush shuttle valve (M10).
3. Lubricate and Install new O-rings to all plugs.
4. Using a 1/4 inch internal hex wrench, install plugs (M16). Torque to 37 N•m [27 lbf•ft].
5. Using a 1/8 inch internal hex wrench, install plugs (M18). Torque to 6 N•m [4 lbf•ft].
6. Using petroleum jelly to retain them, install new O-rings (G36, G38, G42) or install gasket (G420).
7. Install the control housing onto the end cap.
8. Install screws (M22). Torque screws to:
•
78 N•m [58 lbf•ft] for 80 cc, and 110cc motors using an 8mm internal hex wrench.
•
110 N•m [81 lbf•ft] for 160cc and 250cc motors using a 10 mm internal hex wrench.
11009446 • Rev BA • July 2014
Wrench size
1/8 internal hex
5 mm internal hex
1/4 internal hex
8 mm internal hex
10 mm internal hex
Torque
6 Nm [4 lbf•ft]
12 Nm [6 lbf•ft]
31 Nm [27 lbf•ft]
78 Nm [58 lbf•ft]
110 Nm [81 lbf•ft]