Versalift VST-9000I-E100, Руководство по обслуживанию и установке

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103-19 VERSALIFT VST-9000-I-E
SER
VICE PROCEDURES
the platform in a direction tipping the platform toward
the turret. The platform should not move. Tighten the
hose fi ttings and purge the system of air.
Leveling Circuit Relief Valve
Figure 7
To check the rod end holding valve for the outer/
inner boom assembly cylinder,
raise the outer/
inner boom assembly a few inches with the lower
boom stowed. With the hydraulic pump off and a
load in the platform, slowly operate the outer/inner
boom assembly lower function. The outer/inner
boom assembly should not move.
To check the base end holding valve for the
outer/inner boom assembly cylinder,
follow the
procedure below. First make sure the outer/inner
boom assembly is either supported or fully stowed
to prevent the boom assembly from dropping. This
is critical because the cylinder will not hold a load
with either holding valve removed. Open the related
bleeder ports briefl y to relieve any pressure. Be
prepared for a fl ow of hot oil coming from the bleeder.
D A N G E R :
AV O I D A N Y C O N TA C T
BETWEEN HYDRAULIC OIL AND SOURCES
OF HIGH HEAT OR OPEN FLAMES. DEATH OR
SERIOUS INJURY MAY RESULT FROM A FIRE.
WA R N I N G :
C O N TA C T W I T H H O T
HYDRAULIC OIL CAN CAUSE SERIOUS BURNS
W H I C H R E Q U I R E I M M E D I AT E M E D I C A L
ATTENTION.
Remove both the rod-end and base-end holding
valves from the cylinder. Switch the holding valves
(From base end to rod end and rod end to base end)
and reinstall in the cylinder. It is certain that air has
ADJUSTMENTS
CARTRIDGE HOLDING VALVES - Cartridge type,
holding valves are integral components in the outer
boom, extension, and leveling slave cylinders.
Holding valves provide two important safety features.
First, holding valves make smooth operation of the
booms and platform possible. Secondly, in the event
of a hydraulic line failure the holding valves prevent
the booms or platform from dropping.
WARNING:
FAILURE TO RELIEVE
CYLINDER PRESSURE BEFORE THE HOLDING
VALVES ARE REMOVED MAY RESULT IN
DAMAGE TO THE HOLDING VALVE SEALS OR
A HIGH PRESSURE HYDRAULIC OIL SPRAY.
THE SPRAY OR MIST CAN PUNCTURE OR
BECOME EMBEDDED BENEATH THE SKIN OR
CONTAMINATE THE EYES. THESE CONDITIONS
REQUIRE IMMEDIATE MEDICAL ATTENTION.
Remove pressure inside the cylinder before the
holding valves are removed. The best procedure
for relieving pressure is to stow the booms, turn
off the pump, and open the bleeder ports briefl y.
Be prepared for a fl ow of hot oil coming from the
bleeder ports.
These holding valves are factory set and no fi eld
adjustments are permitted. To determine if a holding
valve is functioning properly follow the procedure
below.
To check the base-end holding valve for the slave
cylinder,
Rotate the platform to the end position.
Place a load into the platform. Raise the platform 12
inches off the ground. Loosen the hoses at the “C1”
& “C2” ports on the leveling circuit relief valve (See
Figure 7) until oil fl ows from the hoses.
WARNING:
The oil may be hot and under pressure. Tighten
the hose fi ttings. The platform should not have
moved during this procedure. To purge the air from
the system raise and lower the slave cylinder several
times. In addition raise the upper boom several times
to purge air from the master cylinder.
To check the rod-end holding valve for the slave
cylinder,
Rotate the platform to the side position.
Position the upper boom at an angle no lower than
-20°. Loosen the hoses at the “C1” & “C2” ports on
the leveling circuit relief valve (See Figure 8) until oil
fl ows from the hoses.
WARNING: The oil may be hot and under
pressure.
Apply a 100 lb minimum force at the top of