Danfoss J 45 Service guide
Service Manual
Open Circuit Axial Piston Pumps
Series 45 J Frame
powersolutions.danfoss.com
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Revision history Table of revisions
Date Changed Rev
September 2016 Added displacement limiter adjustments 0203
March 2016 add Fan Drive Control 0202
September 2014 add ETL and angle sensor BA
December 2012 AH
2 | © Danfoss | September 2016 AX00000041en-US0203
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Contents
Introduction
Overview..............................................................................................................................................................................................5
Safety precautions............................................................................................................................................................................5
Unintended machine movement..........................................................................................................................................5
Flammable cleaning solvents.................................................................................................................................................5
Fluid under pressure..................................................................................................................................................................5
Personal safety............................................................................................................................................................................. 5
Symbols used in Danfoss literature............................................................................................................................................6
General description......................................................................................................................................................................... 6
System circuit.....................................................................................................................................................................................7
Technical Specifications
General specifications.....................................................................................................................................................................9
Hydraulic parameters................................................................................................................................................................... 10
Inlet pressure..............................................................................................................................................................................10
Pressure compensator valve setting..................................................................................................................................10
Case pressure............................................................................................................................................................................. 10
Hydraulic fluid ...........................................................................................................................................................................10
Temperature range..................................................................................................................................................................10
Fluid viscosity.............................................................................................................................................................................10
Filtration ......................................................................................................................................................................................10
Features
Auxiliary mounting pads.............................................................................................................................................................11
Input shafts.......................................................................................................................................................................................11
Control options...............................................................................................................................................................................11
Operation.....................................................................................................................................................................................11
PC control....................................................................................................................................................................................12
LS control.....................................................................................................................................................................................12
Electric Proportional Controls..............................................................................................................................................13
PLUS+1® Compliance......................................................................................................................................................... 13
Electric Proportional Control Principle........................................................................................................................13
Electric On/Off Controls..........................................................................................................................................................14
PLUS+1® Compliance......................................................................................................................................................... 14
Electric On-Off Control Principle....................................................................................................................................14
Fan Drive Control (FDC)..........................................................................................................................................................14
PLUS+1 Compliance...........................................................................................................................................................14
Fan Drive Control Principle .............................................................................................................................................15
S45 pump with integrated FDC control schematic.................................................................................................16
Electronic Torque Limiting Controls (ETL).......................................................................................................................16
Pressure Measurement
Required tools.................................................................................................................................................................................18
Port locations and gauge installation.....................................................................................................................................18
Initial Start-Up Procedures
General...............................................................................................................................................................................................19
Start-up procedure........................................................................................................................................................................19
J Frame pumps with radial endcap....................................................................................................................................19
Fluid and Filter Maintenance
Recommendations........................................................................................................................................................................ 20
Troubleshooting
Excessive noise and/or vibration..............................................................................................................................................21
Actuator response is sluggish....................................................................................................................................................21
System operating hot...................................................................................................................................................................21
Low pump output flow................................................................................................................................................................22
Pressure or flow instability..........................................................................................................................................................22
System pressure not reaching PC setting............................................................................................................................. 23
High inlet vacuum..........................................................................................................................................................................23
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Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Contents
Adjustments
PC control..........................................................................................................................................................................................24
FDC Control......................................................................................................................................................................................25
Control Adjustment.................................................................................................................................................................26
FDC Control Data......................................................................................................................................................................26
Fan Drive Control pressure setting guidelines...............................................................................................................26
LS control.......................................................................................................................................................................................... 27
Displacement limiter.....................................................................................................................................................................28
Minor Repair
Shaft seal replacement.................................................................................................................................................................30
Auxiliary pads.................................................................................................................................................................................. 31
LS and PC Controls.........................................................................................................................................................................32
Electric Controls..............................................................................................................................................................................35
Electronic Torque Limiting Control......................................................................................................................................... 36
Fan Drive Control........................................................................................................................................................................... 37
Angle Sensor....................................................................................................................................................................................39
Servo Control Orifice.....................................................................................................................................................................40
Servo Control Orifice Disassembly..................................................................................................................................... 40
Servo Control Orifice Reassembly.......................................................................................................................................41
Plug and fitting sizes and torques........................................................................................................................................... 41
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Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Introduction
Overview
This manual includes information for the installation, maintenance, and minor repair of the Series 45
frame J open circuit axial piston pumps. The manual includes a description of the units and their
individual components, troubleshooting information, and minor repair procedures. Performing
installation, maintenance, and minor repair of Series 45 J frame axial piston pumps according to the
procedures in this manual will not affect your warranty.
Performing minor repairs requires the unit to be removed from the vehicle/machine. Thoroughly clean
the unit before beginning maintenance, or repair activities. Since dirt and contamination are the greatest
enemies of any type of hydraulic equipment, follow cleanliness requirements strictly. This is especially
important when changing the system filter and when removing hoses or plumbing.
A worldwide network of Danfoss Authorized Service Centers (ASCs) is available for major repairs. Major
repairs require the removal of the unit’s endcap, which voids the warranty unless done by an ASC.
Danfoss ASCs are trained by the factory and certified on a regular basis. You can locate your nearest ASC
using the distributor locator at www.Danfoss.com
Safety precautions
Always consider safety precautions before beginning a service procedure. Protect yourself and others
from injury. Take these general precautions whenever servicing a hydraulic system.
Unintended machine movement
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable / disconnect the mechanism
while servicing.
Flammable cleaning solvents
Warning
Some cleaning solvents are flammable. To avoid possible fire, do not use cleaning solvents in an area
where a source of ignition may be present.
Fluid under pressure
Warning
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious
injury and/or infection. This fluid may also be hot enough to cause burns. Use caution when dealing with
hydraulic fluid under pressure. Relieve pressure in the system before removing hoses, fittings, gauges, or
components. Never use your hand or any other body part to check for leaks in a pressurized line. Seek
medical attention immediately if you are cut by hydraulic fluid.
Personal safety
Warning
Protect yourself from injury. Use proper safety equipment, including safety glasses, at all times.
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Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Introduction
Symbols used in Danfoss literature
WARNING may result in injury Tip, helpful suggestion
CAUTION may result in damage to product or
property
Reusable part Apply grease / petroleum jelly
Non-reusable part, use a new part Apply locking compound
Non-removable item Inspect for wear or damage
Option - either part may exist Clean area or part
Superseded - parts are not interchangeable Be careful not to scratch or damage
Measurement required Note correct orientation
Flatness specification Mark orientation for reinstallation
Parallelism specification Torque specification
External hex head Press in - press fit
Internal hex head Pull out with tool – press fit
Torx head Cover splines with installation sleeve
O-ring boss port Pressure measurement/gauge location or
Lubricate with hydraulic fluid
specification
The symbols above appear in the illustrations and text of this manual. They are intended to communicate
helpful information at the point where it is most useful to the reader. In most instances, the appearance
of the symbol itself denotes its meaning. The legend above defines each symbol and explains its purpose.
General description
Danfoss Series 45 J frame open circuit piston pumps convert input torque into hydraulic power.
Rotational force is transmitted through the input shaft to the cylinder block. The input shaft is supported
by tapered roller bearings at the front and rear of the pump and is splined into the cylinder block . A lipseal at the front end of the pump prevents leakage where the shaft exits the pump housing. The spinning
cylinder block contains nine reciprocating pistons. Each piston has a brass slipper connected at one end
by a ball joint. The slippers are held to the swashplate by the spring retainer and block spring. The block
spring also holds the cylinder block to the valve plate. The reciprocating movement of the pistons occurs
as the slippers slide against the inclined swashplate during rotation. Via the valve plate, one half of the
cylinder block is connected to pump inlet and the other half to pump outlet. As each piston cycles in and
out of its bore, fluid is drawn from the inlet and displaced to the outlet thereby imparting power into the
system circuit. A small amount of fluid is allowed to “leak” from the cylinder block/valve plate and slipper/
swashplate interfaces for lubrication and cooling. Case drain ports are provided to return this fluid to the
reservoir.
The volume of fluid displaced into the system circuit is controlled by the angle of the swashplate. The
swashplate is forced into an inclined position (into stroke) by the bias spring. The servo piston opposes
the action of the bias spring forcing the swashplate out of stroke when hydraulic pressure in the control
circuit rises above the spring force.
The pump control, by varying the pressure at the servo piston, controls the displacement of fluid in the
system circuit. Controls designed for Pressure Compensation (PC) or Load Sensing (LS) are available. For a
detailed description of control operation, refer to Control options.
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LS spool
LS adjustment
PC adjustment
PC spool
Servo piston
Bias spring
Input shaft
Tapered
roller
bearing
Tapered
roller
bearing
Block
spring
Piston
Slipper
Swashplate
Slipper retainer
Shaft seal
LS control
(attached to endcap)
Cylinder block
Valve plate
P104 362
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Introduction
Pump and control sectional view
System circuit
The pump receives fluid directly from the reservoir through the inlet line. A screen placed in the inlet
protects the pump from large contaminants. The output of the pump is directed to a PVG-32 multisection load sensing directional control valve which directs fluid to the actuators in the system. Fluid
returning from the system is cooled by a heat exchanger and cleaned by a filter before returning to the
reservoir.
The speed of the actuators in the system depends on the volume of fluid being provided by the pump.
The operating pressure varies depending on actuator load, but is limited to an adjustable maximum
setting by the PC section of the pump control and by a system relief valve integrated into the side
module of the PVG valve.
The position of the PVG valve sets the demand for flow in the system and communicates this to the
pump control by means of a hydraulic signal (load sense signal). The pump will provide as much flow to
the system as it demands1 while limiting the maximum pressure. Therefore flow and pressure in the
system are compensated to meet requirements.
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P104 366E
System pressure
Servo pressure
Actuator pressure
Load sense pressure
Actuator return
Suction / case drain /
system return
Reservoir
Filter
Double-acting cylinder
PVG 32
multi-section
load
sensing
control
valve
Bi-directional
gear motor
Heat exchanger
J Frame Series 45
open circuit axial
piston pump with
load sensing control
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Introduction
Pictorial circuit diagram
Full available flow is a function of pump displacement, operating speed, and efficiency. Refer to Series 45
Axial Piston Open Circuit Pumps Technical Information, 520L0676 for details.
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Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Technical Specifications
General specifications
Features and options
Feature Unit Model
J45B J51B J60B J65C J75C
Maximum Displacement cm³ [in³] 45 [2.75]] 51 [3.11] 60 [3.66] 65 [3.97] 75 [4.58]
Flow at rated speed (theoretical) l/min
[US gal/min]
Input torque at maximum displacement
(theoretical)
Mass moment of inertia of internal rotating
components
Weight Axial ports kg [lb] 23.13 [51]
Radial ports 26.65 [58.8]
Rotation Clockwise, Counterclockwise
Mounting 2 bolt SAE-B, 4 bolt SAE-C
Auxiliary mounting SAE-A, SAE-B, SAE-BB, SAE-C
System ports (type) SAE R-ring boss. 4-bolt split flange
System ports (location) Axial, Radial
Control types PC, Remote PC, LS, LS with internal bleed
Shafts Splined 13-tooth, 14-tooth, 15-tooth
Displacement limiters Available
N•m/bar
[lbf•in/1000 psi]
kg•m²
[slug•ft²]
Tapered Ø 31.75 mm [1.25 in], 1:8 taper
Straight Ø 31.75 mm [1.25 in]
126.0
[33.3]
0.716
[436.9]
0.00455
[0.00336]
137.7
[36.4]
0.811
[495.1]
0.00455
[0.00336]
156.0
[41.2]
0.956
[583.6]
0.00455
[0.00336]
162.6
[42.9]
1.035
[631.4]
0.00433
[0.00319]
180
[47.5]
1.193
[728.1]
0.00433
[0.00319]
Ratings
Rating Units Model
J45B J51B J60B J65C J75C
Input speed¹ minimum min-1 (rpm) 500 500 500 500 500
continuous 2800 2700 2600 2500 2400
maximum 3360 3240 3120 3000 2880
Working pressure maximum bar [psi] 310 [4495] 310 [4495] 310 [4495] 260 [3770] 260 [3770]
External shaft loads External moment (Me) N•m [lbf•in] 226 [2000] 226 [2000] 226 [2000] 226 [2000] 226 [2000]
Thrust in (Tin), out (Tout) N [lbf] 2200 [495] 2200 [495] 2200 [495] 2200 [495] 2200 [495]
Bearing life at 140 bar [2030 psi] B10 hours 29 712 29 712 29 712 10 755 10 755
at 210 bar [3045 psi] 6834 6834 6834 2474 2474
at 260 bar [3770 psi] 3151 3151 3151 — —
at 310 bar [4495 psi] 1666 1666 1666 — —
Mounting flange load
moments
Vibratory (continuous) N•m [lbf•in] SAE-C: 1500 [14 000], SAE-B: 735 [6500]
Shock (max) SAE-C: 5600 [50 000], SAE-B: 2600 [23 000]
1. Continuous input speeds are valid at 1 bar absolute [0 in HG vac] inlet pressure. Maximum input speeds
require changing the inlet pressure or reducing pump displacement..
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Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Technical Specifications
Hydraulic parameters
Inlet pressure
Minimum pressure, continuous = 0.8 bar absolute [6.7 inches Hg vac.] (at reduced maximum pump
speed)
Minimum pressure, cold start = 0.5 bar absolute [15.1 inches Hg vac.]
Pressure compensator valve setting
Minimum: 100 bar [1450 psi]
Maximum: 310 bar [3770 psi] (depending on displacement)
For more information, refer to Series 45 J Frame Axial Piston Open Circuit Pumps Technical Information,
520L0676.
Case pressure
Maximum continuous: 0.5 bar [7 psi] Above inlet
Intermittent: 2 bar [29 psi] Cold start
Hydraulic fluid
Refer to Danfoss publication Fluids and Filtration BLN-9887 or 520L0463. For information on
biodegradable fluids refer to Biodegradable Hydraulic Fluids, 520L0465. See Fluid and filter maintenance
for recommended fluid and filter change intervals.
Temperature range
Hydraulic fluid viscosity must be maintained within the prescribed limits.
Intermittent (cold start): - 40° C [- 40° F]
Continuous: 82° C [180° F]
Maximum: 104° C [220° F]
As measured at the hottest point in the system, e.g. drain line.
Fluid viscosity
Viscosity limits
Rating mm2/s (cSt) [SUS]
ν continuous minimum 9 [58]
maximum 110 [500]
ν intermittent minimum 6.4 [47]
maximum (cold start) 1000 [4700]
Filtration
Required cleanliness level: ISO 4406 Class 18/13 or better. Refer to Danfoss publications Fluids and
Filtration BLN-9887 or 520L0463 and Design Guidelines for
Selecting and Maintaining the Required Hydraulic Fluid Cleanliness 520L0465. See Fluid and filter
maintenance for recommended fluid and filter change intervals.
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P104 361
P104 360
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2
3
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Features
Auxiliary mounting pads
Auxiliary mounting pads are available for all radial ported Series 45 pumps. These pads are typically used
for mounting auxiliary hydraulic pumps.
Since the auxiliary pad operates under case pressure, an O-ring must be used to seal the auxiliary pump
mounting flange to the pad. The drive coupling is lubricated by oil from the main pump case. For details
refer to Series 45 J Frame Axial Piston Open Circuit Pumps Technical Information, 520L0676.
Auxiliary pad options
Input shafts
Control options
Series 45 J frame pumps are available with a variety of splined, straight keyed, and tapered end shafts. For
information on shafts refer to Series 45 J Frame Axial Piston Open Circuit Pumps Technical Information,
520L0676.
The Series 45 Frames J have three possible general control options, a Load Sensing (LS) control with
Pressure Compensator (PC), a PC only control, or an electric control.
Operation
The bias spring (1) pushes against the servo piston (2) which pulls the swashplate (3) to max angle
causing the pump to stroke. Internal pressure on the servo piston acts against the bias spring to reduce
the swashplate angle causing the pump to destroke. Swashplate angle determines pump outlet flow. The
pump control, depending on conditions in the system circuit, sets swashplate angle by metering system
pressure to the servo piston.
Cross-section pump
Bias spring and servo piston set swashplate position
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P104 049
4
5
6
Load
pressure
Load sense
pressure
System
pressure
Tank
Return
pressure
P101 665E
Spool
Spring
guide
Spring
LS adjusting
plug
LS spring
PC adjusting
plug
Plug
Plug
Spool
Spring
guide
Spring
(PC heavy)
P104 051
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Features
PC control
The PC control design maintains a constant pressure in the hydraulic circuit as flow varies. The PC control
modulates pump flow accordingly to maintain system pressure at the PC setting as the PC adjusting plug
(4) and spring (5) defines.
When system pressure, acting on the non-spring end of the PC spool (6), overcomes the force of the PC
spring, the spool shifts porting system pressure to the servo piston and the swashplate angle decreases.
When system pressure drops below the PC setting, the PC spring shifts the spool in the opposite
direction connecting the servo piston to pump case and the swashplate angle increases. The swashplate
is maintained at whatever angle is required to keep system pressure at the PC setting.
Cross-section PC control
PC spool shifts to port system pressure to servo piston
LS control
The LS control design matches pump flow with system demand. The LS control senses the flow demand
of the system as a pressure drop across the External Control Valve (ECV). As the ECV opens and closes, the
pressure delta across the valve changes. When opening, the delta decreases. When closing, the delta
increases. The LS control then increases or decreases pump flow to the system until the pressure delta
becomes equal to the LS setting as defined by the LS adjusting plug (7) and spring (8).
Typical load-sensing control valve
Pressure drop across external control valve defines system demand
Cross-section LS control
12 | © Danfoss | September 2016 AX00000041en-US0203
LS spool shifts to port system pressure to servo piston
The LS control consists of two spool valves that connect the servo piston either to pump case or system
pressure. The PC spool (6) controls the pressure-compensating function of the control as previously
described. The LS spool (9) controls the load-sensing function. The PC spool has priority over the LS spool.
Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Features
Through internal porting, system pressure (upstream of ECV) is applied to the non-spring end of the LS
spool, and through hydraulic line connected at port X, LS pressure (downstream of ECV) is applied to the
spring end. This arrangement allows the LS spool to act on the delta between system pressure and LS
pressure. The LS spring sets the threshold of operation (LS setting).
Because the swashplate is biased to maximum angle, the pump attempts to deliver full flow to the
hydraulic system. When the flow being delivered exceeds demand, the pressure delta across the ECV is
great enough to overcome spring force and shift the LS spool porting system pressure to the servo
piston. The pump de-strokes reducing flow until the delta across the ECV becomes equal to the LS
setting. When flow being delivered is less than demand, the delta across the ECV drops below the LS
setting and the LS spring shifts the spool connecting the servo piston to pump case. The pump strokes
increasing flow until the delta across the ECV becomes equal to the LS setting.
When the external control valve is placed in neutral, it connects the LS signal line to drain. With no LS
pressure acting on the non-spring end of the LS spool, the pump adjusts stroke to whatever position
necessary to maintain system pressure at the LS setting. The pump is now in standby mode.
Because of the series arrangement of the LS and PC spools, the PC spool will override the LS spool. If at
any time system pressure reaches the PC setting, the PC spool will shift blocking the passage that
connects the LS spool with the servo piston and porting system pressure to the servo piston causing the
pump to destroke.
Electric Proportional Controls
PLUS+1® Compliance
All Series 45 Electric controls have met and passed the Danfoss PLUS+1® compliance standard testing,
and as such, this Series 45 control is PLUS+1® compliant. PLUS+1® compliance blocks are available on the
Danfoss website, within the PLUS+1 Guide section.
Electric Proportional Control Principle
The Electric Proportional Control consists of a proportional solenoid integrated into a Remote Pressure
Compensated control. This control allows the pump to be operated at any pressure limit between the
Load Sense and Pressure Compensation settings by varying the current sent to the solenoid.
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Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
Features
Electric On/Off Controls
PLUS+1® Compliance
All Series 45 Electric controls have met and passed the Danfoss PLUS+1® compliance standard testing,
and as such, this Series 45 control is PLUS+1® compliant. PLUS+1® compliance blocks are available on the
Danfoss website, within the PLUS+1 Guide section.
Electric On-Off Control Principle
The Electric On/Off Control consists of an On/Off solenoid integrated into a Remote Pressure
Compensated control. This control allows the pump to be operated at either the Load Sense pressure
setting when “On”, or the Pressure Compensation pressure setting when “Off”.
Fan Drive Control (FDC)
PLUS+1 Compliance
All Series 45 Electric controls have met and passed the Danfoss PLUS+1 compliance standard testing, and
as such, this Series 45 control is PLUS+1 compliant. PLUS+1 compliance blocks (software) are available on
the Danfoss website, within the PLUS+1 Guide section.
14 | © Danfoss | September 2016 AX00000041en-US0203
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