Product Overview
The H1P045, H1P060, H1P068, H1P210, and H1P250 are core models within the Danfoss H1P series of closed-circuit variable displacement axial piston pumps. The H1P series employs a cradle swashplate design, serving as a pioneer platform in the closed-circuit variable piston pump segment, with displacements spanning 45–280 cm³/rev across 15 specifications, maximum working pressure up to 450 bar, and peak pressure of 480 bar.
The H1P series is renowned for high total efficiency, compact lightweight design, and extensive control options. Pump output flow is proportional to input speed and displacement, with displacement infinitely adjustable between zero and maximum. Flow direction can be reversed by simply tilting the swashplate to the opposite side of its zero-displacement position. The series can be used with any Danfoss hydraulic motor to form a complete closed-circuit hydraulic system.
H1P Series Core Features: Designed for quality and reliability; wide range of controls; high total efficiency; compact, lightweight, and length optimized; standardized connector interface; PLUS+1® compliant control and sensor options; integral filtration available with integrated filter bypass sensors and switch.
Model Code Breakdown (using H1P045LAAF2C1DE5FG4NNF03F03BP22P1NNNNNN as example):
H1P045: H1P series, nominal size 045, geometric displacement 45.0 cm³/rev
L: Rotation direction, left-hand (counterclockwise, viewed from shaft end)
A: Product version A
A: Port configuration, ANSI O-ring boss port configuration
F2: Control type code, F2 corresponding to a specific EDC configuration
C1: Orifice code
DE5: Endcap type, D6 = twin port Code 62 metric 4-bolt flange with suction filter; E5 = remote filtration, ORB
FG4: F = mounting flange code (ISO 3019-1 flange 101-2 SAE B); G4 = input shaft code (ISO 3019-1, outer Ø22 mm, 13 teeth splined shaft 16/32 pitch)
NN: Auxiliary mounting pad option, NN = none
F03: Protection type and pressure setting code
F03: Second side protection type and pressure setting code
BP22: B = charge pump (12 cm³/rev); P22 = charge pressure relief setting 22 bar
P1: Special hardware features code
NNNNNN: Paint, nametag, and settings codes
Drop-in Replacement Advantage: Manufactured to exact Danfoss OEM specifications, these pumps achieve complete drop-in interchangeability with the original H1P series for ISO 3019-1 mounting flange, shaft dimensions (ANSI B92.1 splined shaft), SAE main port layout, and control module interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 450 bar pressure loading, control response, and volumetric efficiency under conditions replicating real-world duty cycles.
Technical Specifications
H1P045:
Model Code: H1P045
Series: Danfoss H1P Series (Closed Circuit, Cradle Swashplate Design)
Geometric Displacement: 45.0 cm³/rev (2.75 in³/rev)
Maximum Working Pressure: 420 bar (6092 psi)
Maximum Pressure: 450 bar (6527 psi)
Rated Speed: 3400 rpm
Maximum Speed: 3500 rpm
Theoretical Flow (at rated speed): 153 L/min (40 US gal/min)
Mounting Flange: SAE B 2-bolt flange
Weight: 41 kg (90 lb, without PTO and filter)
Control Options: EDC, FNR, NFPE, MDC, AC²⁾, FDC
H1P060:
Model Code: H1P060
Series: Danfoss H1P Series (Closed Circuit, Cradle Swashplate Design)
Geometric Displacement: 60.4 cm³/rev (3.69 in³/rev)
Maximum Working Pressure: 420 bar (6090 psi)
Maximum Pressure: 450 bar (6525 psi)
Rated Speed: 3500 rpm
Maximum Speed: 4000 rpm
Theoretical Flow (at rated speed): 210 L/min (55.5 US gal/min)
Mounting Flange: SAE C 4-bolt flange
Weight: 50 kg (110 lb)
Control Options: EDC, FNR, NFPE, MDC, AC²⁾, FDC
H1P068:
Model Code: H1P068
Series: Danfoss H1P Series (Closed Circuit, Cradle Swashplate Design)
Geometric Displacement: 68.0 cm³/rev (4.15 in³/rev)
Maximum Working Pressure: 380 bar (5510 psi)
Maximum Pressure: 400 bar (5800 psi)
Rated Speed: 3500 rpm
Maximum Speed: 4000 rpm
Theoretical Flow (at rated speed): 238 L/min (62.8 US gal/min)
Mounting Flange: SAE C 4-bolt flange
Weight: 50 kg (110 lb)
Control Options: EDC, FNR, NFPE, MDC, AC²⁾, FDC
H1P210:
Model Code: H1P210
Series: Danfoss H1P Series (Closed Circuit, Cradle Swashplate Design)
Geometric Displacement: 211.5 cm³/rev (12.91 in³/rev)
Maximum Working Pressure: 450 bar (6527 psi)
Rated Speed: 2600 rpm
Maximum Speed: 2800 rpm
Theoretical Flow (at rated speed): 549 L/min (145 US gal/min)
Mounting Flange: SAE E 4-bolt flange
Control Options: EDC, MDC, NFPE, FDC, AC
H1P250:
Model Code: H1P250
Series: Danfoss H1P Series (Closed Circuit, Cradle Swashplate Design)
Geometric Displacement: 250.0 cm³/rev (15.26 in³/rev)
Maximum Working Pressure: 450 bar (6527 psi)
Rated Speed: 2600 rpm
Maximum Speed: 2800 rpm
Theoretical Flow (at rated speed): 650 L/min (172 US gal/min)
Mounting Flange: SAE E 4-bolt flange
Control Options: EDC, MDC, NFPE, FDC, AC
Key Technical Advantages
1. High Total Efficiency with Compact Lightweight Design
The H1P series is renowned for high total efficiency and compact lightweight design. The cradle swashplate design enables the pump to deliver high power output while maintaining a small installation envelope. The H1P045 achieves a displacement of 45 cm³/rev with a weight of only 41 kg, leading its displacement class in power density. The length-optimized housing design is particularly suitable for skid steer loaders, trenchers, asphalt pavers, and other mobile hydraulic applications with strict installation space requirements.
2. Flow Direction Reversal with Bidirectional Variable Capability
The H1P series’ cradle swashplate design enables flow direction reversal by simply tilting the swashplate to the opposite side of its zero-displacement position, eliminating the need for additional directional valves. This characteristic makes the H1P series an ideal choice for closed-circuit hydrostatic travel drives, achieving smooth forward/reverse switching by simply changing the swashplate angle, particularly suitable for skid steer loaders, aerial lifts, and other equipment requiring frequent directional changes.
3. Extensive Control Options with Flexible Configuration
The H1P series offers an industry-leading combination of control options:
EDC (Electrical Displacement Control): Proportional displacement control via proportional solenoid with 12V/24V supply options and manual override
MDC (Manual Displacement Control): Converts mechanical input to hydraulic signal via spring-centered four-way servo valve; maximum handle input torque only 1.4 N·m
FNR (Forward-Neutral-Reverse): Solenoid-operated forward/reverse switching; 3-position FNR control options A9 (12V) and B1 (24V) use electrical input signal to switch the pump to full stroke position
NFPE (Non-Feedback Proportional Electric): Proportional displacement control without position feedback
FDC (Fan Drive Control): Optimized for engine cooling fan drives
AC (Automotive Control): Speed-related automatic regulation
4. Integrated Charge Pump and Filtration System
The H1P series offers an optional integrated charge pump (e.g., 12 cm³/rev), providing cooling and leakage compensation flow for the closed circuit while supplying the pressure oil required for swashplate operation. The charge pressure relief valve setting is typically 20–24 bar. The integral filtration system with integrated filter bypass sensors and switch enables real-time monitoring of filter status to ensure hydraulic system fluid cleanliness.
5. High-Strength Cast-Iron Housing with Long Service Life
The pump body is precision-cast from high-strength cast iron, with the material’s damping characteristics effectively suppressing structural vibration and fluid-borne noise. The H1P series employs precision-ground pistons and cylinder bores with micron-level clearances. The valve plate employs precision lapping with optimized pre-compression and pre-decompression angles, maintaining stable volumetric and mechanical efficiency at 450 bar maximum pressure.
6. Standardized Interface with PLUS+1® Compliant Control
The H1P series features standardized connector interfaces and PLUS+1® compliant control and sensor options, enabling seamless integration into modern mobile equipment electronic control systems. Standardized SAE mounting flanges (SAE B through SAE E) and shafts require no adaptation for replacement, significantly reducing equipment downtime.
Application Areas
Skid Steer Loaders: Travel drives and work equipment hydraulic systems
Trenchers: Trench chain drives and travel hydraulic systems
Asphalt Pavers: Travel drives and paving equipment hydraulic systems
Windrowers: Travel drives and work equipment hydraulic systems
Aerial Lifts: Travel drives and boom hydraulic systems
Turf Care Equipment: Reel drives and travel hydraulic systems
Vibratory Rollers: Vibration and travel drive hydraulic systems
Construction Equipment: Excavator, loader, and other closed-circuit travel drive systems
Expert Maintenance Tips
1. Hydraulic Fluid Cleanliness
The H1P series control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15/12 or better. Recommended fluids are ISO VG46 anti-wear mineral hydraulic oils (per DIN 51524 T.2). Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.
2. EDC Electronic Displacement Controller Maintenance
If equipped with EDC control module, regularly inspect proportional solenoid electrical connectors for corrosion, moisture ingress, or loose pins. EDC control supports 12V/24V supply options; confirm that supply voltage matches solenoid specifications. Verify the control current signal waveform with an oscilloscope every 2,000 hours to ensure proper PWM waveform and accurate displacement control.
3. MDC Manual Displacement Controller Maintenance
The H1P series MDC control module is equipped with a spring-centered four-way servo valve, with maximum handle input torque of only 1.4 N·m. Regularly inspect the linkage mechanism for wear and clearance, ensuring normal operating feel and accurate response. Apply appropriate grease to linkage joints to prevent corrosion and binding. The MDC is equipped with a Neutral Start Switch (NSS); regularly check its function to ensure safe starting.
4. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure must not exceed specified values. The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. Charge pressure should be maintained at approximately 20 bar to ensure proper closed-circuit operation and stable control system performance.
5. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Position the control at neutral (zero displacement) and run at low speed for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only after confirming adequate lubrication and charge pressure should the pump be loaded.
6. Integral Filter Maintenance
If equipped with integral filtration, regularly check the filter bypass sensor and switch operating status. Replace the filter element at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first. When replacing the filter, simultaneously inspect the filter housing seal ring condition to ensure no leakage. Integral filtration effectively extends hydraulic fluid and pump service life.
