44
Troubleshooting Information
KMR 1250 B, LPG, D
Check hydraulic unit
By contamination within the hydraulic system,
the debris container can no longer be raised after
a brief operating period. The fine orifices in the
hydraulic unit are blocked.
As the hydraulic unit is maintenance-free and
should not be opened. It must be replaced as an
assembly if required.
With the debris container lowered, the hydraulic
fluid level should be approx. 2 to 3 cm (0.80-1.18
in) below the edge of the filler neck.
Note:
Extremely clean working conditions and
work habits are a prerequisite for working
on the hydraulic system.
After a replacement, all hydraulic system com-
ponents automatically purge themselves when
the raising mechanism is actuated repeatedly.
As a result, only the lifting cylinder must be purged
separately.
1
Hydraulic fluid filler neck
Y1 Solenoid valve, Tilt Container
Y2 Solenoid valve, Raise / Lower Container
Check hydraulic fluid
When the unit is cold, the use of nonstandard
hydraulic fluid will cause the debris container to
be raised only very slowly.
The correct choice of hydraulic fluid (see “Spec-
ifications”) facilitates working at temperatures to
-10 °C (14 °F) without difficulty.
Hydraulic unit
Bleeding (purging) air from lifting cylinder
Debris Container – Very Slow Ascent
Purge lifting cylinder
–
Raise container to the top position, and sup-
port to prevent inadvertent descent.
–
Press Raise Container button again, while at
the same time cracking the purge screw on
the lifting cylinder. When all air has escaped
and hydraulic fluid exits without bubbles, tight-
en purge screw.
–
Wipe up hydraulic fluid runoff, and check flu-
id level in reservoir.
DANGER – FATAL INJURY HAZARD
Raised container must be reliably
supported while personnel is working
underneath.
Hydraulic unit
Y1
Y2
1
Y1
Y2
1
