Definitions; Repair; Control Housing Disassembly - Danfoss 51 Series Service Manual

Service Manual
EP, EQ, ER, ES Controls

Repair

Series 51 Electrohydraulic Proportional Controls Service Manual
E*-A5 Schematic
M4
A
Max.
displ.
B
Multifunction Block
M7
X1

Definitions

E*-A1 is the electrohydraulic proportional with PCOR and BPD.
E*-A2 is the electrohydraulic proportional with PCOR.
E*-A5 is the electrohydraulic proportional without PCOR.
* = P, Q, R, or S

Control Housing Disassembly

Do not remove PCP valve (M1) unless replacing it. PCP valve is sold as a complete unit. O-rings are not
available separately.
1. Using a 5/32-inch internal hex wrench, remove screws (M12).
2. Remove the pressure control pilot (PCP) valve (M1) from the control valve housing. (There are no
repairable parts in the PCP.)
3. Using a 1/4-inch in internal hex wrench remove plug (M44), if present.
4. Remove and discard O-ring (M44A).
5. Using a 1/4-inch internal hex wrench remove plugs (M32).
6. Remove and discard O-rings (M32A).
7. Using a 4 mm internal hex wrench remove the screws (M18).
8. Remove valve housing.
9. Remove and discard O-rings (M30, M36, and M38).
10. Remove cover plate (M14). Remove and discard gasket (M16).
11. Remove bias spring (M26). Remove pilot piston (M24).
12. Remove pin (M28).
13. Using a 1/8-inch internal hex wrench remove plug (M42).
14. Remove and discard the O-ring (M42A).
11009448 • Rev BA • July 2014
M3
M1
L1
L2
M5
M2
M8
P101 903
Control
35