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Danfoss TMM 089 User Manual

Danfoss TMM 089
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Overview
This section defines the operating parameters and limitations for TM Motors with regard to output
speeds and pressures. For actual parameters, refer to the operating parameters for each displacement.
Output speed
Minimum speed is the lowest output speed. Operating below minimum speed limits the system can be
unstable.
Rated speed is the highest input speed recommended at full power condition. Operating at or below
this speed generally yields satisfactory product life.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces product
life and can cause loss of hydrostatic power and braking capacity. Never exceed the maximum speed
limit under any operating conditions.
W
Warning
Unintended vehicle or machine movement hazard.
Exceeding maximum speed may cause a loss of hydrostatic drive line power and braking capacity. You
must provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold the
vehicle or machine in the event of hydrostatic drive power loss.
System pressure
System pressure is the differential pressure between system ports A & B. It is the dominant operating
variable affecting hydraulic unit life. High system pressure, which results from high load, reduces
expected life. Hydraulic unit life depends on speed and normal operating—or weighted average—
pressure that you can only determine from a duty cycle analysis.
Applied pressure is the chosen application pressure in the order code for the motor. This is the pressure
at which the drive line generates maximum pull or torque in the application.
Rated pressure is the design pressure for the motor. Applications with applied pressures at or below this
pressure should yield satisfactory unit life given proper component selection.
Maximum pressure (peak) is the highest intermittent pressure allowed under any circumstances.
Applications with applied pressures between rated and maximum require factory approval with
complete application, duty cycle, and life expectancy analysis.
All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low loop
pressure from gauge readings to compute the differential.
Case pressure
Do not exceed rated case pressure under normal operating conditions. During cold start, keep case
pressure below maximum intermittent case pressure. Size drain plumbing accordingly.
C
Caution
Possible component damage or leakage.
Operation with case pressure in excess of stated limits may damage seals, gaskets, and/or housings,
causing external leakage. This condition may also affect performance since charge and system pressure
are referenced to case pressure.
Service Manual
TMM Transit Mixer Axial Piston Motor, Size 070/084/089
Operating parameters
12 L1211037 • Rev AC • Apr 2014

Table of Contents

Questions and Answers:

Danfoss TMM 089 Specifications

General IconGeneral
BrandDanfoss
ModelTMM 089
CategoryEngine
LanguageEnglish

Summary

Introduction

Safety precautions

General precautions for servicing hydraulic systems, including warnings.

Unintended machine movement

Warning about unintended machine movement causing injury.

Flammable cleaning solvents

Warning about the flammability of cleaning solvents.

Fluid under pressure

Warning about the dangers of hydraulic fluid under pressure.

Personal safety

Advises on using proper safety equipment and protecting oneself.

Hazardous material

Warning about hydraulic fluid being a hazardous material.

Operation

High pressure relief valve (HPRV) and check valve

Describes the HPRV function for limiting excessive system pressures.

Operating parameters

Technical Specifications

Fluid and Filter Maintenance

Initial Start-up

Troubleshooting

System operating hot

Troubleshooting steps for systems operating at high temperatures.

System will not operate in either direction

Troubleshooting guide for systems that fail to operate in either direction.

System noise or vibration

Addresses common causes and solutions for system noise and vibration.

Sluggish system response

Troubleshooting steps for slow or sluggish system responses.

Transmission operates normally in one direction only

Diagnosing issues when transmission only operates in one direction.

Low motor output torque

Troubleshooting for low motor output torque issues.

Improper motor output speed

Diagnosing and resolving issues with improper motor output speed.

Adjustments

Speed sensor PPU adjustment

Guides on setting the speed sensor distance from the speed ring.

Minor Repair

Shaft Seal Replacement

Guides on replacing the shaft seal of the motor.

High Pressure Relief Valves (HPRV)

Details removal and inspection of HPRVs.

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