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Series 42
Danfoss Series 42 Service Manual
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41/51 cm
3
base unit with MDC and no filtration adapter
Case drain
port
L2
Servo pressure
gauge port
M5
Charge pressure
gauge port
M3
Charge pump
inlet port
S
Servo pressure
gauge port
M4
Case drain
port
L1
System pressure
gauge port
M2
System
pressure
port
B
System
pressure
port
A
System pressure
gauge port
M1
LEFT SIDE
VIEW
RIGHT SIDE
VIEW
P108 068E
Filtration adapters (28/32 cm
3
, and 41/51 cm
3
models)
Inlet from
filter
,
port
E
Charge pressure
gauge,
por
t
M3
Outlet to
filter
,
port
D
Charge pressure
gauge,
por
t
M3
P108 084E
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Pressure Measurement
24
520L0638 •
Rev 0300
•
July 2015
23
25
Table of Contents
Default Chapter
3
Table of Contents
3
July
5
Overview
5
Warranty
5
General Instructions
5
Safety Precautions
6
Symbols Used in Danfoss Literature
7
1998 Model Release
8
Overview
8
Description of Change
8
Functional Description
9
Overview
9
General Description and Cross-Sectional View
9
The System Circuit
10
Pump Features
10
Filtration Options
12
Displacement Limiters
14
Charge Check / High Pressure Relief Valves
14
Bypass Valves
15
Auxiliary Mounting Pads
15
Control Options
17
Manual Displacement Control (MDC)
17
Electrical Displacement Control (EDC)
17
High Current Electrical Displacement Control (HC-EDC)
18
Non-Feedback Proportional Hydraulic (NFPH) Control
18
Non-Feedback Proportional Electric (NFPE) Control
19
Forward-Neutral-Reverse (FNR) Three-Position Electric Control
20
Technical Specifications
22
Specifications
22
Pressure Measurement
23
Required Tools
23
Port Locations and Pressure Gauge Installation
23
Ports and Pressure Gauges
23
Initial Start-Up Procedure
25
General
25
Start-Up Procedure
25
Fluid and Filter Maintenance
26
Recommendations
26
Troubleshooting
27
Overview
27
System Operating Hot
27
System Response Is Sluggish
27
System will Not Operate in Either Direction
28
System will Not Operate in One Direction
29
Neutral Difficult or Impossible to Find
29
Adjustments
30
Overview
30
Displacement Limiter Adjustment
30
Pump Neutral Adjustment
32
Control Neutral Adjustment for MDC and EDC/HC-EDC
33
Minor Repair
35
Standard Procedures
35
Size and Torque for Plugs and Fittings
35
Charge Relief Valve
37
Optional Speed Sensor
39
MDC Module
40
HC-EDC and EDC Module
43
MDC/EDC Spool, Linkage, and Neutral Adjustment Screw
44
MDC Neutral Start / Backup Alarm Switch
46
MDC Solenoid Override Valve
49
FNR, NFPE, and NFPH Controls (Bolt-On Valves)
51
FNR, NFPE, and NFPH Controls (Integral Valves)
52
System Check Relief (SCR) Valves (High Pressure Relief, Charge Check, and Bypass Valves)
53
Auxiliary Pad/Charge Pump Cover
55
Charge Pump
57
Servo Piston Covers and NFPH Control Orifice
60
Loop Flushing and Loop Flushing Relief Valve
62
Shaft Seal, Roller Bearing, and Shaft Replacement
64
Appendix A - Torques
68
Torque Table
68
Appendix B - Specification Tags
70
Pre-Block Point Change
70
Post-Block Point Change
71
Appendix C - Nomenclature
72
Pre-Block Point Change Nomenclature
72
Post-Block Point Change Nomenclature
73
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Danfoss Series 42 Specifications
General
Brand
Danfoss
Model
Series 42
Category
Water Pump
Language
English
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