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Danfoss 51 Series Service Manual
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Service Manual
Bent Axis Motors
Series 51 and 51-1
powersolutions.danfoss.com
2
Table of Contents
Default Chapter
3
Table of Contents
3
March
5
Overview
5
Ordering Replacement Parts and Service
5
Safety Precautions
5
Symbols Used in Danfoss Literature
6
General Instructions
7
Keep It Clean
7
Inspect for System Contamination
7
Replace the O-Rings and Gaskets
7
Lubricate All Moving Parts
7
Torque Procedure
7
Variable Displacement Motors
7
Series 51-1 Motors
8
Closed Circuit
9
Open Circuit
10
Shafts
11
Operation
12
Loop Flushing
12
Displacement Limiters
13
Mounting Configurations
14
Speed Sensors
16
Controls
17
Overview
17
Two-Position Controls
17
Pressure-Compensator Controls
19
Proportional Controls
20
Technical Specifications
21
General Specifications
21
Technical Data
21
Fluid Specifications
22
Pressure Measurements
23
Required Tools
23
Port Locations and Gauge Installation
23
Fluid and Filter Maintenance
26
Fluid and Filter Recommendations
26
Hazardous Material
26
Initial Startup Procedures
27
Procedure
27
Troubleshooting
29
Sluggish System
29
System Operating Hot
29
Excessive Noise or Vibration
29
Motor Operates Normally in One Direction Only
30
Improper Output Speed
30
Low Output Torque
30
Adjustments
32
Overview
32
Charge Pressure Relief Valve
32
Measuring Charge Pressure
32
Adjusting Charge Pressure
32
Minimum Displacement Limiter
33
Adjusting Minimum Displacement
33
Maximum Displacement Limiter
35
Series 51 Motors
36
Series 51-1 Motors
36
Speed Sensor Installation and Adjustment
37
DIN and SAE Flange Units
37
Cartridge Units
39
Minor Repair
40
Shaft Seal Replacement
40
SAE and DIN Flanged Motors
40
Disassembly
40
Inspection
40
Reassembly
40
Cartridge Flanged Motors
41
Disassembly
41
Inspection
41
Reassembly
42
Loop Flushing Shuttle Valve
42
Disassembly
42
Inspection
43
Reassembly
43
Charge Relief Valve
44
Overview
44
Poppet Style (Older Production)
44
Disassembly
44
Inspection
44
Reassembly
44
Orificed Style
45
Disassembly
45
Inspection
46
Reassembly
46
Defeat Plug
46
Disassembly
46
Maximum Angle Stop - Series 51 Motors
47
Disassembly
47
Inspection
48
Reassembly
49
Maximum Angle Stop - Series 51-1 Motors
49
Disassembly
49
Inspection
50
Reassembly
50
Minimum Angle Adjustment Screw
51
Disassembly
51
Inspection
51
Reassembly
52
4-Way Valve and Threshold Springs
52
4-Way Valve
52
Disassembly
52
Inspection
54
Reassembly
54
Threshold Adjustment Screw and Springs
54
Disassembly
54
Inspection
56
Reassembly
57
Assembling the 4-Way Valve
57
Other manuals for Danfoss 51 Series
Repair Instructions
36 pages
Service Kit Instructions
2 pages
5
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Danfoss 51 Series Specifications
General
Power Output
Unknown
Cylinders
Unknown
Fuel Type
Unknown
Cooling System
Unknown
Aspiration
Unknown
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