Upright TL33 - 4.5 Setting Hydraulic Pressures

TL33 Work Platform 4-6
Maintenance
SectIon
4.5
4.5 Setting Hydraulic Pressures
(Figure 4-3)
Check the hydraulic pressures whenever the pump,
manifold or relief valve have been serviced or
replaced.
The hydraulic oil may be of sufficient temperature
to cause burns. Wear safety gloves and safety
glasses when handling hot oil.
The oil in the hydraulic system is under very high
pressure which can easily cause severe cuts. Obtain
medical assistance immediately if cut by hydraulic oil.
MAIN RELIEF VALVE (Figure 4-3)
1. Operate the hydraulic system for 10-15 minutes to
warm the oil.
2. Remove the cover from the 1
st
post.
3. Insert pressure gauge into high pressure gauge port
on top of front face of main manifold block.
4. Loosen locknut on main relief valve and turn adjusting
screw counter clockwise two full turns.
5. Operate lower boom down function switch at lower
controls and keep it activated.
6. Slowly turn the main relief valve adjusting screw
clockwise until the pressure gauge reads 140 Bar
(2030 p.s.i.) pressure.
7. Release the boom down switch.
8. Tighten locknut on main relief valve while holding
the adjusting screw in position.
Figure 4-3: Main Manifold Block
4.6 Maintenance on Elevating Assembly
(Figure 4-4)
The only time the Elevating Assembly needs to be elevated to
allow service work to be carried out is when working on the Slew
Limit Switch.
All other work (Bearings, Cylinders, Booms & Tension Bars) can
and must be performed with the Elevating Assembly in the
stowed position.
When working on the Slew Limit Switch follow the procedure
detailed below.
BEFORE entering Elevating Assembly while performing
maintenance on work platform while elevated, ensure that
Elevating Assembly properly
supported by suitable cranage of adequate capacity.
(Recommended 1 tonne capacity crane and sling.)
INSTALLATION
1. Park the work platform on firm level ground.
2. Verify Platform Emergency Stop Switch is ON.
3. Turn Key Switch to"'Ground Control" position.
4. Position Lower Control Boom 1 Switch to "UP" and
elevate until the lower boom is 1600mm (63inches)
above the tow bar.
5. Place a sling of 1000kg load capacity at the end of the
lower boom and first post. Ensure sling is secured so
that it will not slip up along the boom.
6. Push Lower Control Boom 1 Switch to "DOWN" and
gradually lower the platform until Lower Boom is supported
by the sling.
REMOVAL
1. Push Lower Control Boom 1 Switch to "UP" position
and gradually raise the platform until the sling can be
removed.
2. Remove the sling.
3. Push Lower Control Boom 1 Switch to "DOWN" and
completely lower platform.
4. Turn Key Switch to "OFF"
Figure 4-4: Supporting the Elevating Assembly
WARNING
WARNING
MAIN RELIEF
VALVE
HIGH PRESSURE
GAUGE PORT
SLEW LIMIT SWITCH
SLING
1 TONNE CAPACITY
CRANE / WINCH