Inspection; Assembly - Danfoss 51 Series Service Manual

Service Manual
T1, T2, T3, T4, TA, TH, TM, TN
Series 51 Two Position Controls Service Manual
Item
M18

Inspection

1. Clean and inspect the housing and spools for wear, damage or foreign material.
2. Check internal passages for contamination and clean them if necessary.
Position motor with shaft horizontally and control surface up to allow easier assembly of all
components.

Assembly

1. Install spring seat (J30), spring (J10*), and seat (J20).
2. Lubricate and install O-rings (F324).
3. Install the 4-way valve assembly (F32).
4. Using petroleum jelly, lubricate and install O-rings (G38, G42, G36), or install gasket (G420).
5. Install spool (M12).
6. Position control housing (M10) on motor.
7. Install spacers (M24), if used, and screws (M22). Torque screws per table on page 2
8. If present, install plug (N26) using a 3 mm internal hex. Torque to 9 N•m [7 lbf•ft].
9. Lubricate and Install new O-ring (M18A). Install plug (M18). Using a 1/8 internal hex, torque to 6 N•m
[4.5 lbf•ft].
10. Lubricate and Install new O-ring (N20A). Install plug (N20). Using a 1/4 internal hex, torque to 37 N•m
[28 lbf•ft].
11. Lubricate and install shuttle spool (NT42).
12. Install pin (N14), if used. Refer to drawing and table below for spool position.
13. Install spring (NT41) if used (E7/E8/F7/F8 spool only).
14. Lubricate and Install new O-rings (NT40A, M16A). Install plugs (NT40, M16). Using a 1/4 inch internal
hex, torque plugs to 37 N•m [28 lbf•ft].
TH control uses a plastic plug for (M1). TA control uses a steel plug for (M1).
Spool and pin location
XA
3/4 in.
Option
C2/C4
C0/C3
L5/L6
R5/R6
11009442 • Rev CA • January 2015
Wrench size
1/8 internal hex
XB
3/4 in.
P106 361E
Spool (NT42) location
loose in bore
Center of the bore
3/4 inch from XA end
3/4 inch from XB end
Torque
6 N•m [4.5 lbf•ft]
Pin (N14)
No
Yes
Yes
Yes
27