ELECTRICAL SYSTEM
TB20J Plus Maintenance Manual 119
© Feb. 2023
Table 9-3 Table of faults and solutions (Continued)
Fault Cause Solution
Inspect whether the platform controller is
malfunctioning.
Inspect whether the Deltatech plug of ground controller
is firmly and correctly connected.
Tilt alarm always
sounding while in level
status
The level switch is not
connected or faulty.
Inspect whether the level switch is inserted properly and
firmly.
Inspect whether the level switch is malfunctioning.
Platform failed to be
leveled
Electrical failure
Check the wiring and control program
Function solenoid problem
Check the function solenoid, adjust the pressure or
replace the function solenoid
Cylinder or pipeline leakage
Check the pipeline and connectors for leakage.
Check the cylinder or its seal for leakage.
Platform leveling with
no response
Electrical failure
Check the wiring and control program
Low hydraulic system oil level Check the hydraulic oil level
Function solenoid problem
Check the function solenoid, adjust the pressure or
replace the function solenoid
Oil lines blocked Check the oil lines
Slave cylinder failure Repair or replace the cylinder
Pump damaged Replace the pump
Boom movement
switches on platform
controller with no
response
The switch is not in correct
position
The key switch is in neutral position.
The ground controller is in ground control position.
The emergency stop button on the ground controller or
platform controller is pressed.
Boom function switch not
enabled with the foot switch
depressed
Depress the foot switch again
Boom function switch failure
Repair or replace the control switch, and perform
system test
Lift, luffing cylinder holding
valve failure
Repair or replace the holding valve
Bypass valve malfunctioning
Repair or replace the valve, check the wiring diagram or
perform system test
Low hydraulic system oil level Check the hydraulic oil level
Supply pipelines in valve
housing or hydraulic pump
restricted or damaged
Clean or replace the pipeline
Directional valve
malfunctioning
Repair or replace the valve
Lift, luffing cylinder failure
Repair or replace the cylinder
Boom movement
switches on ground
controller with no
response
The switch is not in correct
position
The key switch is in neutral position.
The ground controller is in platform control position.
The emergency stop button on the ground controller or
platform controller is pressed.
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