Troubleshooting And Repair Procedures Shall Be Completed By A Person Trained And Qualified On The Repair Of This Machine; Damaged Or Malfunctioning Machine; Repair Any Machine Damage Or Malfunction Before Operating The Machine; Before Troubleshooting - Terex GS90D-4695 Service And Repair Manual

December 2023
Section 4 Faul t Codes
Observe and Obey:
Troubleshooting and repair procedures shall

be completed by a person trained and
qualified on the repair of this machine
Immediately tag and remove from service a


damaged or malfunctioning machine.

 Repair any machine damage or malfunction
before operating the machine.
Unless otherwise specified, perform each

procedure with the machine in the following
configuration:
• Machine parked on a firm, level surface
• Key switch in the off position with the key
removed
• The red Emergency Stop button in the off
position at both the ground and platform
controls
• Wheels chocked
• All external AC power supply disconnected
from the machine
• Platform in the stowed position
Part No. 1325652GT
Control System Fault Codes

Before Troubleshooting:





Note: Two persons will be required to safely
perform some troubleshooting procedures.
GS -3390 • GS -4390 • GS
™ ™
Service and Repair Manual
Read, understand and obey the safety rules
and operating instructions in the appropriate
operator's manual on your machine.
Be sure that all necessary tools and test
equipment are available and ready for use.
Read each appropriate fault code thoroughly.
Attempting short cuts may produce hazardous
conditions.
Be aware of the following hazards and follow
generally accepted safe workshop practices.
Crushing hazard. When testing
or replacing any hydraulic
component, always support
the structure and secure it
from movement
Electrocution/burn hazard.
Contact with electrically charged
circuits could result in death or
serious injury. Remove all rings,
watches and other jewelry.

Bodily injury hazard. Spraying

hydraulic oil can penetrate and
burn skin. Loosen hydraulic

connections very slowly to allow

the oil pressure to dissipate

gradually. Do not allow oil to

squirt or spray.

Indicates that a specific result is expected
after performing a series of steps.
Indicates that an incorrect result has occurred
after performing a series of steps.
-5390
™
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