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Installation and Maintenance Manual, Compact CA
Fault finding
Hydraulic motor with MDA brake
Hydraulic motor with two-speed valve, VTCA 600
Fault Probable cause Action
Insufficient braking torque. The brake cylinder is not drained
in the described manner, exces-
sive counter pressure in drainage
line.
The brake linings or the discs are
worn out.
Remove the cause of the pressure.
Concerning the maximum counter
pressure, see the section dealing
with draining the brake cylinder
under 3.3.10/13, "Draining of brake
cylinder".
Control of braking torque accord-
ing to 3.1.14. Dismantle the brake
and replace the worn discs.
The brake does not open. Insufficient brake opening pres-
sure.
Seals or piston damage.
For the required opening pressure
see the section dealing with brake
MDA under 3.1.7 "Brake MDA".
Replace seals. Replace the piston.
IMPORTANT!
The spring in the brake cylinder is
tensioned.
Fault Probable cause Action
Motor only works at one speed. Pilot pressure low.
The valve piston has stuck in
single-speed position due to
impurities in the oil.
Suitable pilot pressure - see AC-
3.1 Engineering manual.
Inspect piston and remove impuri-
ties.
Fault finding
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