Section 5. Troubleshooting Model 8210/8250 Maintenance Manual
Symptom Tables: Travel (Forward/Reverse) System
5-22 Publication: 1146945/001, Revised: 25 Sep 2018
Symptom Tables: Travel
(Forward/Reverse)
System
NOTE: Use these symptom tables in
conjunction with the electrical
schematics and hydraulic schematics.
Slow Travel, Lift/Lower OK. No Fault Codes
Truck Does Not Accelerate Correctly
Possible Cause Action
Truck configured for slow speed Check the truck configuration.
Battery problems Lead acid battery: Replace the battery with a fully-charged battery.
Lithium-ion battery: Check charge status LEDs for charge level.
Binding drive wheel
assembly/traction motor
Jack and block the truck. Disable the brake. See “Mechanical Brake
Release” on page 7-37. Check that the drive wheel spins freely. If not,
repair or replace.
Binding brake disc Check the “Air Gap Inspection” on page 7-36.
Check for dragging brake caused by poor or incomplete brake release.
Listen for an audible click to indicate full brake release.
Bad traction motor
(may test OK with no load, but fail
under load)
Repair or replace the traction motor.
Open Arm Angle Switch Check for correct operation of the arm angle proximity switch (SW2)
and correct if necessary. Check the wiring, the traction amplifier, and
the switch adjustment. The arm angle proximity switch (SW2) is
open-circuited. See “Arm Angle Proximity Switch” on page 8-2.
Possible Cause Action
Truck configured for slow
acceleration
Check the truck configuration.
Battery problem Lead acid battery: Verify a correct, fully-charged, good battery (24V) is
installed in the truck.
Lithium-ion battery: Check charge status LEDs for charge level.
Binding or mechanical problem Jack and block the truck. Turn the main ON/OFF switch OFF. Check
the brake, the wheel bearings, and the load wheels to see if there is a
mechanical problem. Repair or replace.
Bad motor With the main ON/OFF switch OFF and the battery disconnected,
check the traction motor. Repair or replace.
Bad traction amplifier If all other possible causes check out, replace the traction amplifier.
Property of American Airlines
To Next Page
Loading...