Product Overview

The M4D1 088 3N00 B102 is a Parker Hannifin / Denison M4D1 fixed displacement hydraulic vane motor. It belongs to the M3B and M4 Denison Vane Technology platform, designed for demanding applications requiring medium pressure, high speed, reversing capability and stable performance over extended service life. Parker highlights pressure-balanced operation, low torque ripple, high starting-torque efficiency and low noise as key design characteristics.

For the M4D 088 frame, Parker specifies:

• 91.1 cm³/rev displacement
• 230 bar maximum continuous pressure
• 2500 rpm maximum operating speed
• 236 N·m output torque at 2000 rpm and 175 bar differential pressure
• 49.4 kW output power at 2000 rpm and 175 bar differential pressure
• 27 kg reference weight.

The complete configuration M4D1 088 3N00 B102 identifies an internal-drain M4D motor with a 91.1 cm³/rev displacement cartridge, SAE C splined shaft, bidirectional rotation, standard porting, design letter B, Buna-N sealing and 4-bolt SAE flange mounting.

Public Parker-linked product records associate the exact model with 024-26130-000 / 024-26130-0.

Our replacement program is based on complete configuration matching, followed by in-place interchangeability verification and 100% simulated working-condition testing.

Technical Specifications

M4D1 088 3N00 B102

• Brand: Parker Hannifin / Denison
• Series: M4D1
• Product Type: Fixed Displacement Hydraulic Vane Motor
• Operating Principle: Pressure-balanced Denison vane technology
• Complete Model: M4D1 088 3N00 B102
• Related Manufacturer Part Number: 024-26130-000 / 024-26130-0.
• Displacement: 91.1 cm³/rev
• Displacement: 5.56 in³/rev
• Maximum Continuous Pressure: 230 bar
• Reference Maximum Continuous Pressure: approximately 3336 psi
• Maximum Operating Speed: 2500 rpm for the M4D 088 product rating
• Low-Load High-Speed Operation: Parker’s M4D maximum-rating curves allow higher speed at lower load/pressure conditions; actual allowable speed must be determined from the pressure-speed curve.
• Theoretical Flow at 2000 rpm: 182 L/min
• Reference Input Flow at 2000 rpm and 175 bar Δp: 206 L/min
• Reference Output Torque at 2000 rpm and 175 bar Δp: 236 N·m
• Reference Output Power at 2000 rpm and 175 bar Δp: 49.4 kW.
• Theoretical Torque Coefficient: 1.45 N·m/bar
• Mounting: SAE C / ISO 3019-1
• Mounting Interface: 4-bolt SAE flange
• Shaft: SAE C splined shaft
• Spline: 12/24 diametral pitch, 14 teeth, 30° pressure angle, flat-root side fit
• Rotation: Bi-directional
• Drain: Internal drain configuration
• Drain Port: Plugged on M4D1
• Port Code: 02 — 4-bolt SAE flange with UNC threads
• Seal Class: S1 — Buna-N
• Design Letter: B
• Porting Combination: 00 — Standard
• Reference Weight: 27.0 kg.

Pressure-rating note

Parker’s official M4D technical data lists 230 bar as the maximum continuous pressure for the 088 frame. A separate peak-pressure rating is not published as an independent number in the current M4D product table reviewed, so no unsupported peak figure is added here.

Parker’s maximum-rating chart also shows that allowable speed changes with pressure. Higher speed is associated with lower load/pressure conditions, so a 4000-rpm figure from the broader low-load operating region should not be represented as the rated speed at 230 bar.

Model-Code Engineering Breakdown

M4D1

M4D Series + Internal Drain

Parker distinguishes:

• M4D: external drain
• M4D1: internal drain

The M4D1 drain port is plugged.

088

The 088 size corresponds to:

• 91.1 cm³/rev displacement
• 1.45 N·m/bar theoretical torque coefficient.

3

The 3 shaft code identifies:

SAE C Splined Shaft

with:

• 12/24 diametral pitch
• 14 teeth
• 30° pressure angle
• Flat-root side fit.

N

N identifies bi-directional rotation.

Parker specifies the port/rotation relationship so that reversing the pressurized port reverses motor rotation.

00

Standard porting combination.

B

B is the design letter. Parker’s public ordering-code table does not assign an additional independent performance specification to this historical design-letter position.

1

1 identifies:

S1 — Buna-N seal class

while 5 is the S5 Viton configuration.

02

02 identifies:

4-bolt SAE flange with UNC threads

while the M4D1 internal-drain configuration uses a plugged drain port.

Key Technical Advantages

1. Pressure-Balanced Vane Architecture

Denison Vane Technology uses a pressure-balanced rotating group consisting of the rotor, vanes and cam ring.

Parker describes a floating pressure port plate with a shuttle-valve arrangement that routes the higher A/B port pressure into the clamping system, maintaining the required hydraulic clearances.

This is particularly important for a reversible vane motor because the high-pressure and low-pressure ports change with the direction of rotation.

2. Through-Hardened High-Alloy Steel Rotor

Parker specifies a through-hardened high-alloy steel rotor for the M3/M4 design. This material architecture is intended for wear resistance and fatigue durability in repeated rotary operation.

3. Hardened Vane and Cam-Ring Materials

The Parker design uses hardened high-alloy steel for the:

• Vanes
• Rotor
• Cam ring

The cam-ring internal surface also uses a lubrication coating to support the sliding interface.

4. Low Torque Ripple

Parker identifies:

• 10 vanes
• Advanced cam-ring profile
• Two torque cycles per revolution
• Low internal dead volume

as contributors to low torque ripple, especially at low speed.

5. High Starting-Torque Efficiency

Parker specifically highlights high starting-torque efficiency, allowing the motor to start under high loads while reducing pressure overshoot, jerking and instantaneous horsepower demand.

6. Stable Low-Speed Operation

Low torque ripple is particularly valuable in low-speed hydraulic drives where torque pulsation can transfer directly into mechanical oscillation and uneven shaft motion.

7. High-Speed Capability

The M4D 088 is rated for 2500 rpm maximum operating speed, while Parker’s operating curves show higher speed regions under lower-load conditions.

This provides a useful combination of:

High Torque + Medium Pressure + High Speed

for demanding rotary applications.

8. Reversible Operation

The N configuration supports bi-directional rotation. Parker explains that reversing the hydraulic flow direction changes the motor rotation.

9. Compact SAE C Installation

The M4D frame uses an SAE C installation interface, while the family offers multiple displacement levels within the same mounting size. This allows equipment designers to change displacement without necessarily redesigning the entire mounting arrangement.

10. Reduced Contamination Sensitivity

Parker states that double-lip vanes reduce sensitivity to fluid contamination. This is a durability feature, not a substitute for filtration and hydraulic-fluid cleanliness management.

Application Areas

Parker’s official M3/M4 documentation identifies applications including:

• Hoist winch drives
• Swing drives
• Propulsion drives
• Mobile hydraulic systems
• Marine hydraulic systems
• Heavy-duty rotary drives.

The M4D1 088 configuration is particularly relevant to:

• Winches
• Hoisting systems
• Swing mechanisms
• Marine auxiliary drives
• Mobile equipment propulsion
• High-load reversible hydraulic drives
• Low-speed/high-torque rotary systems

Final application selection should verify:

Pressure + Speed + Shaft Load + Porting + Drain Configuration

Expert Maintenance Tips

1. Treat M4D1 as an internal-drain motor

The 1 code means the drain configuration is internal. The M4D1 drain port is plugged and should not be treated like the external drain arrangement of an M4D motor.

2. Control low-pressure-side back pressure

Parker specifies approximately 3.5 bar maximum low-pressure-side pressure for the internal-drain M4 family, with a specified pressure peak limit of 7 bar.

Avoid:

• Restricted return lines
• Undersized hoses
• Excessive back pressure
• Incorrect A/B port routing

3. Do not combine 230 bar and 2500 rpm without checking the duty point

The M4D 088 is rated at 230 bar maximum continuous pressure and 2500 rpm maximum operating speed, but the maximum-rating chart shows a pressure-speed relationship. The permissible speed decreases as operating pressure rises.

4. Treat 2500 rpm as the product-rated operating speed

Although the wider M4D curves show higher-speed operation at low load, 2500 rpm is the published maximum operating speed in Parker’s fixed-motor product specification for M4D 088. Higher-speed use should therefore be treated as a specific low-load application condition requiring curve verification.

5. Verify A/B port pressure when reversing

Because N specifies bidirectional operation:

• CW: A is the inlet / pressure port
• CCW: B is the inlet / pressure port

The hydraulic protection strategy must support both operating directions.

6. Match the SAE C spline exactly

The 3 shaft configuration uses:

SAE C spline, 14 teeth, 12/24 DP

Check:

• Spline engagement
• Coupling concentricity
• Shaft end clearance
• Starting torque
• Torsional vibration

before commissioning.

7. Check radial and axial shaft loads

Parker provides permissible shaft-load curves and explicitly states that Fr and Fa should not be applied simultaneously.

For belt drives, chain drives, overhung couplings or other external loads, calculate the actual shaft load at operating speed rather than checking torque alone.

8. Control hydraulic-fluid viscosity

Parker’s performance data is commonly referenced at 24 cSt, with additional leakage curves at 10 cSt. Actual service conditions should be evaluated against oil viscosity at operating temperature rather than by hydraulic-oil grade alone.

9. Ensure proper lubrication during startup

The vane, cam ring and rotor operate through carefully controlled clearances and hydraulic lubrication. Insufficient oil supply during startup can accelerate:

• Vane wear
• Cam-ring scoring
• Rotor-slot wear
• Internal leakage

Parker’s description notes that vane springs and centrifugal force assist vane contact with the cam contour, while hydraulic pressure maintains the operating geometry.

10. Maintain hydraulic cleanliness

Although the double-lip vane design reduces contamination sensitivity, contamination still affects the cam ring, port plate, vanes and rotor.

Before installing a replacement motor, inspect:

• Reservoir
• Return filtration
• Hydraulic lines
• Vane surfaces
• Cam ring
• Rotor slots
• Port plates

11. Apply 100% simulated working-condition testing

For a verified replacement M4D1 088 3N00 B102, final testing should include:

• Low-speed startup
• CW/CCW rotation test
• 91.1 cm³/rev displacement verification
• Flow verification
• 175 bar Δp reference performance
• Continuous-pressure verification
• Speed verification
• Starting-torque test
• Internal leakage measurement
• Low-pressure-side back-pressure verification
• Temperature-rise test
• Shaft-load inspection
• Sustained bidirectional-load test

The core acceptance criteria should cover:

Flow + Torque + Pressure + Speed + Internal Leakage + Temperature

rather than relying on one static pressure measurement.