OPTION AR-LINKAGE 3966781 - Caterpillar

Illustration 1 g01100245
Remove the mast from the mast mount.
Lay the mast on a suitable work area.
Remove the six screws (5) .
Insert the center bolt (6) and remove the base plate for the mast (4) .
Illustration 2 g01105869
Attach a wrench to bolt (8) in order to manually lower the mast to lower height if the mast tube is at the upper limit.Manually raise the mast to a higher height if the mast tube is at the lower limit.
Illustration 3 g01157973
Upper Limit Switch
Illustration 4 g01157974
Lower Limit Switch
Measure the resistance of both limit switches.Expected Result:The resistance measurement is less than 5 ohms.Results:
OK - The measured resistance is less than 5 ohms. Proceed to Test Step 2.
NOT OK - The measured resistance is greater than 5 ohms.Repair: Repair the affected limit switch or replace the affected limit switch. Refer to Special Instruction, REHS2402, "AccuGrade Electric Mast Repair Instructions" for additional information.STOPTest Step 2. CYCLE POWER TO THE SYSTEM
Turn the key start switch for the machine to the OFF position.
Turn the key start switch for the machine to the ON position.Results:
YES - The diagnostic code becomes inactive. Return the machine to normal operation.STOP
NO - The diagnostic code is still active.Repair: Check the connectors of the circuit board of the electric mast. Ensure that the connectors are tight. Check the connectors with caution. The tabs that are used in order to secure the connectors can break off. After checking the connectors, repeat this step. If the diagnostic code is still active, contact your technical communicator for a possible consultation with Caterpillar.STOP