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H1T 045
Danfoss H1T 045 User Manual
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System Schematic for Tandem Pumps
The schematic below shows the function of H1T axial piston variable displacement tandem pumps with
electric displacement control (EDC).
System schematic, tandem pumps
C1
C1
C2
C2
M14
M14
CW
F00B
F00A
F00B
F00A
A
B
MA
E
C
D
MD
MB
M3
L3
MC
M4
M5
M4
M5
PTO
X7
P003 207E
S
e
r
v
i
c
e
M
a
n
u
a
l
H
1
T
0
4
5
/
0
5
3
,
0
6
0
/
0
6
8
A
x
i
a
l
P
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t
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Introduction
12 |
©
Danfoss | September 2020
AX152886481761en-000405
11
13
Table of Contents
Default Chapter
3
Table of Contents
3
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
13
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
23
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
27
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
30
Pressure Measurements
31
Port Locations and Gauge Installation - 045/053
31
Port Locations and Gauge Installation - 060/068
32
Initial Startup Procedures
33
Start-Up Procedure
33
Troubleshooting
35
Safety Precautions
35
High Inlet Vacuum
35
Unintended Machine Movement
35
Independent Braking System
35
Manufacturer's Warranty
35
Electrical Troubleshooting
36
Integral Filter Bypass
36
Neutral Difficult or Impossible to Find
36
Transmission Operates Normally in One Direction Only
36
System Operating Hot
37
System will Not Operate in Either Direction
37
System Noise or Vibration
38
Sluggish System Response
38
Adjustments
39
Standard Procedures
39
Charge Pressure Relief Valve Adjustment
40
Pressure Limiter
43
Pressure Limiter Screens
43
Pressure Limiter Adjustment (060/068 Only)
43
Charge Check / HPRV Adjustment
46
Engaging the Bypass Function
47
Displacement Limiter Adjustment for Tandem Pumps
48
Control Neutral Adjustment
50
Mechanical Neutral Adjustment
52
Pump Setup
52
Servo Adjustment for Tandem Pumps
53
Minor Repair
56
Standard Procedures at Removing Pump
56
EDC Control Repair
56
EDC Control Installation
57
Control Solenoids Repair
58
MDC Control Repair
59
MDC Control Assembly
60
Angle Sensor on EDC Repair
61
EDC with Angle Sensor Repair
62
Shaft, Seal and Bearing Repair
64
Shaft, Seal and Bearing Installation
65
Charge Pump Repair (045/053 Only)
66
Charge Pump Installation
67
Charge Check and HPRV Repair (045/053)
68
HPRV Port Relationship
69
Hprv (60/68)
70
Pressure Limiter Screens
70
HPRV Repair (060/068)
70
Charge Pressure Relief Valve Repair
72
Control Cut-Off Valve / Brake Valve Repair
73
Torque Chart
75
Fasteners and Plugs
75
Fastener Size and Torque Chart
76
Plug Size and Torque Chart
77
4
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Danfoss H1T 045 Specifications
General
Brand
Danfoss
Model
H1T 045
Category
Water Pump
Language
English
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