HMV-210-02

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

For a direct installation into the drive line

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

Two position motors are suitable for open and closed loop operation. Without control signal they are set to maximum displacement Vmax. Adjustment between Vmin and Vmax is smooth and with short response time. The required switching signal can optionally be hydraulic or electric, the servo pressure supply internal or external, see section Functions. Servo pressure supply. The following data are independent of the rated motor size.

Two position control features

Two position motor with hydraulic control pressure and external servo supply pressure

This motor is used primarily for closed loop operation together with speed-dependent hydraulic pump, type HPV-02 CA. Alternatively, with hydraulically or electro-hyraulically pilot-operated drives for which a high pressure regulating function is also required. Without control signal the motor shifts to maximum displacement Vmax. Stepless variable control to lower displacement is hydraulic, with control pressure generated by the speed dependent pump. The motor is also equipped with a system pressure override which, at a predefined setting, automatically increases its displacement in response to system related torque demand. The following data are independent of the rated motor size.

Features of stepless variable control with pressure override

Auxiliary functions

EH1P. Case pressure as reference, «Bleed» regulation / EH1P-CA. Feed pressure as reference, «Non-Bleed» regulation

Characteristic EH1P & EH1P-CA

The double motor consists of two Series 02 variable motors arranged back-to-back. In addition to a wide torque/speed conversion range it offers the option of direct installation in the drive line, since one or two shaft ends are optionally available for torque output. Noise emission and fuel consumption are reduced because no transfer gearbox is required. At the same time the overall efficiency increases. The performance comparison diagram shows the required drive capacity for different design variants at four operating points.

HMV D-02 / Performance comparison

Further features

Product benefits

2-pos. gearbox/conventional transmission / Stepless with double motor

The tandem motor consists of two HMV-02, arranged face-to-back and connected with a tandem flange. Alike the double motor, the tandem motor can also be integrated directly into the driveline and is available with one or two shaft ends.

Further features

Benefits

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

*) Product design on demand
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

HMV-02 with electric override control