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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 pres-
sure. Concerning the maximum
counter pressure, see the section
dealing with draining the brake
cylinder under 3.3.10/13, "Drain-
ing of brake cylinder".
Control of braking torque ac-
cording 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 pres-
sure see the section dealing with
brake MDA under 3.1.7 "Brake
MDA".
Replace seals. Replace the pis-
ton. 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 impu-
rities.
Fault finding
