Bosch rexroth A36VM Instruction Manual page 51

Table 13: Axial piston unit malfunction table
Malfunction
Rotational speed or torque
cannot be reached
Excessively high temperature of
hydraulic fluid and housing
Possible cause
Insufficient flow in hydraulic pump
Minimum or maximum displacement set
incorrectly
Control of the control device defective
Insufficient pilot pressure or control pressure
Malfunction in the axial piston motor control
device or controller
Hydraulic fluid not in optimal viscosity range
Wear or mechanical damage to the
axial piston motor
Wear or mechanical damage to the
hydraulic pump
Wrong direction of rotation
Excessively high inlet temperature at the
axial piston unit
Wrong setting and/or malfunction of the
pressure limitation and pressure control
valves (e.g. high-pressure relief valve,
pressure controller)
Output speed too high
Flushing flow of the flushing valve too low
Axial piston unit worn
Troubleshooting | A36VM
Remedy
Check function of the hydraulic pump
Contact Bosch Rexroth Service
Check control (machine/system manufacturer)
Check pilot pressure or control pressure
Contact Bosch Rexroth Service
Contact Bosch Rexroth Service
Machine/system manufacturer:
Check temperature range and use
suitable hydraulic fluid
Replace axial piston unit
Contact Bosch Rexroth Service
Replace hydraulic pump
Contact Bosch Rexroth Service
Check function of the hydraulic pump
Machine/system manufacturer: Check correct
direction of rotation, see chapter 7.4.1
"Preparation" on page 30
Machine/system manufacturer: Inspect
system, e.g. malfunction in the cooler,
insufficient hydraulic fluid in the reservoir
Optimize the adjustment of the pressure
limitation and pressure control valves of the
axial piston unit and the pressure safeguarding
in the hydraulic system
Contact Bosch Rexroth Service
Contact machine/system manufacturer
Contact machine/system manufacturer
Contact Bosch Rexroth Service
Replace axial piston unit; contact
Bosch Rexroth Service
RE 91650-01-B/2021-07-19, Bosch Rexroth AG
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