HMF-02

Standard Linde-name plate

Each Linde Hydraulics unit features a name plate showing the type and the serial number. For a single order via ‘open variant’ a customer-specific number or free text with up to 15 characters can be stamped on the name plate.

Equipment manufacturers profit by the Linde Hydraulics transmission concept. Due to the direct conversion of the prime mover speed into wheel speed it is possible to reduce the number of drive line components and the energy losses in the operating cycle.

Speed steps of transmission concepts

Starting torque

Linde hydraulic motors offer uniformly high torque for smooth start up. Right from the start.

Torque at 350 bar and 2 rpm

Of a bent axis motor / Of a swashplate motor

Linde high pressure units are designed for excellent reliability and long service life. The actual service life of a hydraulic unit is determined by numerous factors. It can be extended significantly through proper maintenance of the hydraulic system and by using high-quality hydraulic fluid.

Beneficial conditions for long service life

Adverse factors affecting service life

Operational parameters. Filtration

In order to guarantee long-term proper function and high efficiency of the hydraulic motors the purity of the pressure fluid must comply with the following criteria according to Linde Works Standard WN 51 210. High purity oil can extend the service time of the hydraulic system significantly.

In order to ensure the functional performance and high efficiency of the hydraulic motors the viscosity and purity of the operating fluid should meet the different operational requirements. Linde recommends using only hydraulic fluids which are confirmed by the manufacturer as suitable for use in high pressure hydraulic installations or approved by the original equipment manufacturer.

Permitted pressure fluids

Linde offers an oil testing service in accordance with VDMA 24 570 and the test apparatus required for in-house testing. Prices available on request.

Recommended viscosity ranges

In order to be able to select the right hydraulic fluid it is necessary to know the working temperature in the hydraulic circuit. The hydraulic fluid should be selected such that its optimum viscosity is within the working temperature range (see tables).

The temperature should not exceed 90 °C in any part of the system. Due to pressure and speed influences the leakage fluid temperature is always higher than the circuit temperature. Please contact Linde if the stated conditions cannot be met in special circumstances.

Viscosity recommendations

Further information regarding installation can be found in the operating instructions.

Depending on the selected components, different torques may be transferred. Please ensure that the load transfer components such as mounting flange and PTO through-shaft are designed adequately. Our sales engineers will be pleased to provide design advice.

Torque transmission of the hydraulic motor

The diagram Torque transmission of HMF / A / V / R-02 shows the output side A and the PTO through-shaft B of a motor.
The information on the following pages refers to

A) Flange profile

Bolt hole diameter / Bolt hole length

Mounting suggestions

*) Option for standard design, necessary for tandem units

2-hole flange / 4-hole flange

2-hole flange with 4 additional bolt holes

Plug-in housing for HMF/V/R 75-02

Plug-in housing for HMF/V/R 105-02 und 135-02

A) Dimensions drive shafts

A) Linde Hydraulics shaft types

Type 1. Without undercut / Type 2. With undercut

A) Shaft torque

Based on a standard Series 02 variable hydraulic motor with single shaft end, the PTO Through-Drive Motor features two shaft ends for torque transfer. This enables the hydraulic motor to be installed directly in the drive line without transfer gearbox, reducing noise emission and fuel consumption. At the same time the overall efficiency increases.

B) PTO dimensions for HMV-02

B) PTO dimensions / PTO Through-Drive motor w. coupling flanges

Representation of the hydraulic components of a closed loop hydrostatic drive: Variable electro-hydraulic controlled HPV-02 E1 pump (top view) and fixed displacement motor HMF-02 plus filter, cooler and oil tank. The function diagram and the circuit diagram show two types of cooling.

Function diagram

Circuit diagram

1 Hydraulic pump HPV-02 R E1
2 Charge pump
3 Option 1: Cooler in charge circuit
4 Option 2: Cooler in the return line
5 Filter
6 Hydraulic motor HMF-02
7 Tank
8 Venting valve

Representation of hydraulic components in an open loop circuit, based on the LSC system as an example: A HPR-02 regulating pump with load sensing function for energy-saving flow on demand control and VW load sensing directional control valves for load-independent and simultaneous movements of several consumers without mutual influencing. The system is complemented with proven Linde products such as electronic controllers, swing drive and hydraulic motors.

Function diagram

Circuit diagram

1 Hydraulic pump HPR-02 E1L
2 Manifold valve plate
3 Pressure relief function
4 Directional control valves
5 Hydraulic cylinder
6 Hydraulic motor HMF-02
7 Cooler
8 Filter
9 Tank
10 Venting valve

Purge and case flushing is used

For equipment options for Series 02 motors please refer to the model code.

Purge flow in closed loop circuit

Purge valve 1. Without (0 l/min) / Purge valve 2. Standard and increased

Purge valve 3. Restricted / Purge valve 4. Flow controlled

The secondary valves (crossline relief valves) protect the system from pressure overload by using two interlinked pressure relief valves (combined with check valves). It is recommended for applications where this protective function is not provided by other means (e.g. through primary protection at the pump or LS valves). The secondary protection includes a make up function. It prevents cavitation and is required in an open loop circuit if the motor requires more oil than is supplied. For special situations like in the swing gear drive the installation of controllable secondary valves is recommended. For equipment options for Series 02 motors please refer to the model code.

Without crossline relief valve

With crossline relief valve protection

With dual pressure crossline relief valve protection

A, B Work ports
L, L1, U Case drain/vent connections
X, Y Control connection for dual
pressure crossline relief valve
E Make up connection

Pressure regulated motors shift to maximum displacement at high operating pressure, irrespective of which side is under pressure. In propel drives this can have undesirable effects. For example, if the motor shifts to maximum displacement during the transition phase from straight travel with low system pressure to overrun (deceleration, downhill travel) with high pressure on the reverse side, an extremely strong vehicle braking effect will occur. The signal selection for pressure regulator prevents the regulator being subjected to this braking pressure and, therefore, ensures that the motor remains at minimum displacement. For equipment options for Series 02 motors please refer to the model code.

Without signal selection for pressure regulator / With signal selection for pressure regulator

The counterbalance (brake) valve prevents the motor over speeding during an over-run situation. To achieve this, the motor return flow is automatically and continuously metered such that it always matches the input flow. Different braking responses are
possible. The integrated make-up function simultaneously prevents cavitation. A purge and case flushing function is also integrated. Counterbalance (brake) valves are typically used for drive systems in open loop circuits. The function of the high pressure relief valves can be integrated in the counterbalance valves. Further types of counterbalance valves are shown in section “Dimensions. HMR-02”.

With counterbalance (brake) valve, here: axial attachment

Dimensions

Speed sensors electronically register the motor speed and send an associated input signal to electronic drive controls. Examples are shown below.

Without speed sensor / With speed sensor

Based on the respective system requirements, Linde Hydraulics offers fixed displacement, variable displacement and regulating motors with high starting torque for open and closed loop operation. Optional auxiliary functions, zero displacement capacity and PTO through-shaft enable higher machine design flexibility and increase the efficiency of the travel drive. The motors are optionally controlled electrically, hydraulically or pneumatically.

Function overview

HMV-02 H / HMV-02 E

HMV-02 EH1P / HMV-02 PTO

HMV D-02 / HMV T-02

HMR-02 / HMF-02

HMF-02 P / HMA-02

The cross over relief valve block offers additional high pressure protection for the series 02 motors. It is mounted to the radial high pressure ports. As well as this protective function, the block offers tee connectors for the high pressure connections in order to connect an additional motor to the system without the need for long hoses.

Further features

Benefits

The HMF-02 motor is a high-pressure fixed displacement motor for open and closed loop operation. Secondary valves enable customised definition of soft motor start-up and slowdown. With dual setting secondary valves the maximum acceleration and braking torque is additionally available. The settings and shifting ranges can be adjusted according to project-specific requirements, see sections “Functions. Crossline (secondary) protection” and “HMF-02 P”.

Fixed displacement motor HMF-02

Fixed displacement motor with crossline relief valves fixed setting

Motor with dual pressure crossline relief valves

A, B Work ports
L, L1, U Case drain / vent connections
X, Y Control connections for dual pressure
crossline relief valve
E Make up connection

The HMF-02 motor is a high-pressure fixed displacement motor for open loop operation. With integrated LS directional control valve and TC torque control it combines the benefits of the Series 02 with all auxiliary functions typically required for application in swing and winch drives. The HMF-02 P is available in the rated sizes 35, 55, 75 and 105. Differing from the standard HMF, the nominal pressure is 280 bar, the peak pressure is 300 bar.

HMF-02 P with integrated swing function

Features

Product benefits

TC function

For powerful and dynamic application in swing drives the TC function enables control pressure-dependent acceleration. Once the maximum rotating speed is reached, torque control is superimposed and pressure level is reduced for energy-saving operation. If the control valve is reset to the neutral position, no additional control signal is generated and the rotary motion slows down uniformly. Active counter-rotation is possible with controllable secondary valves. A counteractive control signal is generated, and the rotary motion is decelerated along the characteristic counter-rotation pressure curve.

P, T Work port connections
L, U Case drain / vent connections
LS LS-pressure connection
M Gauge ports

*) For dimensions of HMF 35-02 P, 55-02 P, 75-02 P and 105-02 P, please see the installation drawing

Metric connection thread according to ISO 6149-1

Locking thread for the SAE high pressure-connections. Metric according to ISO 261
Hexagon socket head cap screws according to ISO 4762

Radial high pressure-connections

Axial high pressure-connections

Connections

Input flow and drive shaft rotation

The Series 02 motors are based on a modular system with the following characteristics. This enables our distribution partners to configure the product according to your requirements. The latest characteristics and available options can be taken from the model code, which is available on our homepage.