Introduction
Hydrostatics Servicing Overview................................................................................................................................................5
General Servicing Instructions.....................................................................................................................................................5
Safety Precautions............................................................................................................................................................................6
Independent Braking System................................................................................................................................................. 6
High Inlet Vacuum...................................................................................................................................................................... 6
Manufacturer’s Warranty..........................................................................................................................................................6
Symbols used in Danfoss literature............................................................................................................................................6
The Basic Closed Circuit................................................................................................................................................................. 8
Case Drain and Heat Exchanger..................................................................................................................................................8
Tandem Pumps Design.................................................................................................................................................................. 9
H1T pumps pictorial diagram....................................................................................................................................................10
H1T Tandem Pumps Schematics..............................................................................................................................................11
System Schematic for Tandem Pumps...................................................................................................................................12
Operation
Pressure Limiter Valves................................................................................................................................................................ 13
Pressure Limiter Sectional View.......................................................................................................................................... 13
High Pressure Relief Valve (HPRV) and Charge Check Valve..........................................................................................14
HPRV/Charge Check Valve Sectional View......................................................................................................................14
Charge Pressure Relief Valve (CPRV)....................................................................................................................................... 16
Electrical Displacement Control (EDC)...................................................................................................................................16
EDC Operation...........................................................................................................................................................................17
Manual Override (MOR)............................................................................................................................................................... 18
Manual Displacement Control (MDC) ....................................................................................................................................18
MDC Operation..........................................................................................................................................................................19
MDC Torque................................................................................................................................................................................20
Neutral Start Switch (NSS)..................................................................................................................................................... 20
Case Gauge Port M14..............................................................................................................................................................20
Control-Cut-Off (CCO) and Brake Release Valves............................................................................................................... 20
Operating Parameters
Input Speed......................................................................................................................................................................................23
Independent Braking System...............................................................................................................................................23
System Pressure..............................................................................................................................................................................23
Servo Pressure.................................................................................................................................................................................25
Charge Pressure..............................................................................................................................................................................25
Charge Pump Inlet Pressure.......................................................................................................................................................25
Case Pressure...................................................................................................................................................................................25
External Shaft Seal Pressure.......................................................................................................................................................26
Temperature....................................................................................................................................................................................26
Viscosity.............................................................................................................................................................................................26
Technical Specifications
H1 Pumps General Specification..............................................................................................................................................27
Technical Data for H1 Tandem Pumps...................................................................................................................................27
Operating parameters for H1 Tandem Pumps....................................................................................................................28
Fluid Specification......................................................................................................................................................................... 29
Fluid and Filter Maintenance Recommendations
Pressure Measurements
Port locations and gauge installation - 045/053.................................................................................................................31
Port locations and gauge installation - 060/068.................................................................................................................32
Initial Startup Procedures
Start-Up Procedure........................................................................................................................................................................33
Troubleshooting
Safety Precautions......................................................................................................................................................................... 35
High Inlet Vacuum....................................................................................................................................................................35
Unintended Machine Movement....................................................................................................................................... 35
Service Manual
H1T 045/053, 060/068 Axial Piston Tandem Pumps
Contents
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Danfoss | September 2020 AX152886481761en-000405 | 3
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