20
The O/C valve is also fitted with an adjustable relief valve which must be set to 1.25
times the maximum pressure inside the cylinder. If the cartridge is marked with CBBA
you screw the adjusting screw CCW to increase pressure. If screwed fully CW the
cartridge is now fully open and does not hold any load. The O/C valve must be set
correctly to ensure safe operation.
The TL37 can be fitted with a variety of
power options. The battery powered
machine has only one solenoid valve fitted
(SOL1). Both the I.C. engine and the mains
powered version have a separate dump
valve fitted (SOL2). This is because oil is in
circulation all the time, not only just when a
cylinder movement is required as on the
battery version. Having oil circulating
through the different valve blocks may lead
to uncontrolled movements should the
controls accidentally be operated. By fitting
a dump valve the oil will always go to tank
unless the dump valve is activated.
See the relevant circuit diagram for your
machine at the end of this handbook or
contact UpRight or its local representative
for further information if required
Read this in conjunction with the description of the hydraulic circuit (31HC20A) for the
Battery 24VDC powered machine.
TOP & BOTTOM RAM
Each ram is fitted with a manual release to
enable lowering of the boom in case of
emergency. Depress the red button and
hold. When released, the red button will
spring out and the movement should stop.
If the cylinder is operating erratically -
Jamming at odd intervals with the motor
running. - Check that the little restrictor disc
(1) fitted at the nose of the cartridge has not
come loose. The disc is held in pace with a
small circlip. Replace cartridge.
The O/C valve enables the oil to flow freely
into the cylinder but will not let any oil flow
out until a pilot signal is received when
pumping oil into the annular side of the ram.
The O/C valve will then open up and let oil
flow out, in a controlled manner, to prevent
boom juddering.
Type CBBA part no : 13-0392
Em. Lower Part no : 13-2228
(1)
MAINTENANCE PROCEDURE
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