SGS TJ3LP - Maintenance and Troubleshooting; Purging Air from Hydraulic System; Checking and Topping Up Oil Level; Troubleshooting Common Issues

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PURGING AIR FROM THE TROLLEY JACK
If air becomes trapped inside the hydraulic system of the trolley jack,
the proper working of the trolley jack will be reduced and it may not
fully support the vehicle weight. Air can be purged from the hydraulic
system as follows:
1. Turn the handle anti-clockwise to allow oil to circulate freely around
the system. Remove the filler plug.
2. Pump the handle several times to purge air from the
hydraulic system.
3. Replace the filler plug, then turn the handle clockwise and test the
jack. If efficiency is still low, check the oil level as below.
CHECKING THE OIL LEVEL
If the jack has been stored for long periods, check for oil leaks before
use. If necessary, check the oil level as follows:
1. Ensure the trolley jack is properly lowered by turning the handle
fully anti-clockwise.
2. Remove the oil filler plug on the top of the ram assembly.
A flat-bladed screwdriver will be required.
NOTE:
The oil should be almost level with the bottom of
the oil filler hole. Oil replacement can be
sought by contacting us at SGS Engineering
MAINTENANCE TROUBLESHOOTING TABLE
PROBLEM CAUSE SOLUTION
Trolley jack will not
raise to it’s full height
• Low oil level
• Air in cylinder
• O-rings worn
• Check for leakage and
top up if required via
the oil plug
• Pump handle to purge
air from system
• Return to SGS Engi-
neering for repair
Trolley jack will not
hold the weight of
the vehicle
• Release valve not
tightly closed
• Release valve not
seating
• Air in cylinder
• Check valve is closing
fully
• Return to SGS Engi-
neering for repair
• Pump handle to purge
air from system
Trolley jack does not
lower when the valve
is opened
• Cylinder over-
filled with oil
• Piston or pivot
arm bent or
binding
• Disconnected
or broken return
spring
• Drain off excessive oil
• Return to SGS Engi-
neering for repair
• Return to SGS Engi-
neering for repair
• Lubricate hinged joints
Trolley jack feels
‘spongy’
• Air trapped in
the system
• Perform system air
purge
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