Secure the unit
For repair, place the unit in a stable position with the shaft pointing downward. It is necessary to secure
the pump while removing and torquing end covers, controls, and valves.
Safety precautions
Always consider safety precautions before beginning a service procedure. Protect yourself and others
from injury. Take the following general precautions whenever servicing a hydraulic system.
Warning
Unintended vehicle or machine movement hazard
When using the RDM in combination with S45 open circuit pumps with LS or EPC be aware that there will
likely be motor movement as long as the engine is turning. Due to the LS-setting of the pump, a standby
pressure will remain in the system even if the normally closed control is fully energized. Lowest standby
pressures to the motor, 15-18bar or above, may be enough to turn the RDM and has the potential to
cause injury or damage.
Warning
Flammable cleaning solvents
Some cleaning solvents are flammable. To eliminate the risk of fire, do not use cleaning solvents in an
area where a source of ignition may be present.
Warning
Fluid under pressure
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious
injury and/or infection. This fluid may also be hot enough to cause burns. Use caution when dealing with
hydraulic fluid under pressure. Relieve pressure in the system before removing hoses, fittings, gauges, or
components. Never use your hand or any other body part to check for leaks in a pressurized line. Seek
medical attention immediately if you are cut by hydraulic fluid.
Warning
Personal safety
Protect yourself from injury. Use proper safety equipment, including safety glasses, at all times.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Introduction
6 520L0638 • Rev 0300 • July 2015
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