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Danfoss
Water Pump
MP1
Danfoss MP1 Service Manual
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Response Time
Stroking
direction
0.8 mm [0.03] orifice
1.0 mm [0.04] orifice
1.3 mm [0.05] orifice
28/32
38/45
28/45
38/45
28/45
38/45
Neutral to full
flow
1.5 s
2.2 s
0.9 s
1.4 s
0.6 s
0.8 s
Full flow to
neutral
0.9 s
1.1 s
0.6 s
0.7 s
0.4 s
0.5 s
S
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M
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1
Operation
©
Danfoss | April 2019
AX00000244en-000201 | 31
30
32
Table of Contents
Default Chapter
3
Table of Contents
3
Hydrostatics Servicing Overview
6
General Instructions
6
Remove the Unit
6
Lubricate Moving Parts
6
Replace All O-Rings and Gaskets
6
April
6
Danfoss | April
7
Safety Precautions
7
Unintended Machine Movement
7
Flammable Cleaning Solvents
7
Fluid under Pressure
7
Personal Safety
7
Symbols Used in Danfoss Literature
7
Danfoss | April
8
Technical Specifications
9
MP1 Design Specifications
9
MP1 Technical Data
9
MP1 Operating Parameters
10
MP1 Fluid Specifications
10
Operation
11
MP1 High Pressure Relief Valve (HPRV) and Charge Check
11
Bypass Function
11
MP1 Charge Pressure Relief Valve (CPRV) Function
12
Loop Flushing Valve
13
Electrical Displacement Control (EDC)
14
EDC Principle
14
EDC Operation
14
Control Signal Requirements, EDC
15
EDC Solenoid Data
15
Control Response
16
MP1 EDC Response Time
16
Manual over Ride (MOR)
16
Swash Plate Angle Sensor for EDC Controls
18
Swash Plate Angle Sensor Parameters (EDC)
18
Swash Plate Angle Sensor Connector
19
Interface with ECU (EDC)
19
Manual Displacement Control
19
MDC Principle
19
MDC Operation
21
MDC Shaft Rotation
21
Control Response
22
MP1 MDC Response Time
22
Neutral Start Switch (NSS)
22
Case Gauge Port M14
23
Lever
24
Forward-Neutral-Reverse (FNR) Electic Control
24
FNR Principle
24
Control Response
26
Response Time, FNR
27
Non Feedback Proportional Electric Control (NFPE)
27
Control Signal Requirements
28
Control Response
28
Response Time
29
Non-Feedback, Proportional Hydraulic (NFPH) Control
29
Control Response
30
Response Time
31
Control-Cut-Off Valve (CCO Valve)
32
CCO Solenoid Data
33
Brake Gauge Port with MDC
34
Displacement Limiter
34
Displacement Change (Approximate)
34
Contents
35
Operating Parameters
35
Input Speed
35
System Pressure
35
Danfoss | April
35
Charge Pressure
36
Charge Pump Inlet Pressure
36
Case Pressure
36
Temperature
36
Viscosity
37
Fluid and Filter Maintenance
38
Filtration System
38
Pressures Measurements
39
MP1 Port Locations and Gauge Installation
39
Initial Startup Procedure
41
General
41
MP1 Start-Up Procedure
41
Troubleshooting
43
Overview
43
Safety Precautions
43
Electrical Troubleshooting
43
System Operating Hot
44
Transmission Operates Normally in One Direction Only
44
System Does Not Operate in Either Direction
44
System Noise or Vibration
45
Neutral Difficult or Impossible to Find
45
Sluggish System Response
45
Pump Adjustment
46
Standard Procedures
46
Charge Pressure Relief Valve
46
Displacement Limiter
47
Control Neutral Adjustment
48
Mechanical/Hydraulic Neutral Adjustment
49
Servo Adjustment
49
Verify Neutral Setting
50
Servo Adjustment Side M4
50
Minor Repair
52
MP1 Standard Procedures and Pump Removal
52
EDC Control
52
MP1 EDC Control Removal
52
Controls Inspection
53
MP1 EDC Control Assembly
53
MP1 Control Solenoids/Actuator Housing Replacement
54
MDC Control
55
MP1 MDC Control Removal
55
MDC Illustration
56
MDC Legend
56
Controls Inspection
57
MDC Control Assembly
57
Charge Pump
57
MP1 Charge Pump Removal
57
MP1 Charge Pump Inspection
58
MP1 Charge Pump Assembly
58
High Pressure Releif Valve (HPRV)
58
MP1 HPRV Valve Removal
59
HPRV Valve Inspection
59
HPRV Valve Reassembly
59
Charge Pressure Relief Valve (CPRV)
59
MP1 CPRV Removal
59
CPRV Inspection
60
MP1 CPRV Assembly
60
Ax00000244En
60
MP1 Loop Flushing Removal (28/32)
61
Danfoss | April
61
MP1 Loop Flushing Spool Inspection
62
Reassembly
62
Shaft Removal
62
Inspection
63
Shaft Reassembly
63
Fastener Size and Torque Chart
64
Fastener Size and Torque
64
MP1 Plug Size and Torque
65
4
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Danfoss MP1 Specifications
General
Brand
Danfoss
Model
MP1
Category
Water Pump
Language
English
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