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Danfoss H1P Series User Manual
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The schematic above shows the function of a hydrostatic transmission using an H1 axial variable displacement pump with electric
proportional displacement control (EDC) and an H1 bent axis variable displacement motor with electric proportional control (L*) and
integrated loop flushing device.
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Introduction
©
Danfoss | September 2020
AX152886482551en-000504 | 11
10
12
Table of Contents
Table of Contents
3
Hydrostatics Servicing Overview
5
General Servicing Instructions
5
Safety Precautions
6
Symbols Used in Danfoss Literature
7
General Description of H1 Family Hydrostatic Pumps
7
Design
8
H1 Single Pumps Closed Circuit Pictorial Diagram
10
H1 System Schematic
10
Operation
12
Pressure Limiter Valves
12
Pressure Limiter Sectional View
12
High Pressure Relief Valve (HPRV) and Charge Check Valve
12
Hprv/Charge Check Valve Sectional View
13
Charge Pressure Relief Valve (CPRV)
13
Bypass Function
13
System Schematic for Single Pump
14
Electrical Displacement Control (EDC)
14
EDC Operation
15
Manual Override (MOR)
16
Manual Displacement Control (MDC)
16
MDC Operation
17
MDC Torque
18
Neutral Start Switch (NSS)
18
Case Gauge Port M14
18
Operating Parameters
19
Input Speed
19
System Pressure
19
Servo Pressure
20
Charge Pressure
20
Charge Pump Inlet Pressure
20
Case Pressure
20
External Shaft Seal Pressure
21
Temperature
21
Viscosity
21
Technical Specifications
22
H1 Pumps General Specification
22
H1P 069-250 Physical Properties
22
Fluid Specification
23
Fluid and Filter Maintenance Recommendations
24
Filtration System
24
Pressure Measurements
26
Port Locations and Gauge Installation
26
H1P Ports Information
26
Initial Startup Procedures
28
Unintended Machine Movement
28
Start-Up Procedure
28
Troubleshooting
30
High Inlet Vacuum
30
Unintended Machine Movement
30
Fluid under Pressure
30
Electrical Troubleshooting
30
Integral Filter Bypass
30
Neutral Difficult or Impossible to Find
31
Transmission Operates Normally in One Direction Only
31
System Operating Hot
31
System will Not Operate in Either Direction
32
System Noise or Vibration
32
Sluggish System Response
32
Adjustments
34
Standard Procedures
34
Charge Pressure Relief Valve Adjustments
34
Pressure Limiter Adjustment
35
Engaging the Bypass Function
37
Displacement Limiter Adjustment for Single Pumps
37
Control Neutral Adjustment
38
Mechanical Neutral Adjustment
40
Unintended Machine Movement
40
Minor Repair
43
Angle Sensor on EDC Repair
47
EDC with Angle Sensor Repair
48
Torque Chart
61
Fasteners and Plugs
61
Fastener Size and Torque Chart
62
Plug Size and Torque Chart
63
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Danfoss H1P Series Specifications
General
Brand
Danfoss
Model
H1P Series
Category
Water Pump
Language
English
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