Elliott Digger Derrick, Руководство по эксплуатации и техническому обслуживанию, Страница: 219 / 376

Troubleshooting EEC-0023 V1.1
Troubleshooting
BOOM EXTENDS DURING TRANSPORTATION
Check for oil leaks. Clean or replace holding valve and check setting. Rebuild cylinder
and replace seals.
BOOM CREEPS BACK AFTER BEING EXTENDED
As hydraulic oil cools it is normal for it to retract in the telescope cylinder and let the
boom creep in slightly. If the creep continues, check for leaks first. Then clean and/or
replace the holding valve and check the setting. Finally, remove the telescope cylinder
and rebuild it replacing the seals.
BOOM TELE OUT, WINCH UP AND BOOM DOWN ARE NOT WORKING
If these are the only functions not working, check to see if the boom head is two
blocked. Next check the load per the Capacity Chart to make sure it is not an overload.
Then refer to the LML and Anti-Two Block operator’s manual for trouble shooting this
system. Also check the wiring from the system to the solenoid valves and the operation
of the valves to make sure they are not jammed.
BOOM DEFLECTS EXCESSIVELY-UP/DOWN OR SIDE TO SIDE-WHEN PICKING
LOAD
Wear pads are not shimmed properly. Re-shim wear pads per section in manual.
BOOM OPERATING SLOWLY OR NOT PICKING LOAD
Check for leaks and damaged hose. Check relief valve settings. Reset as required.
Check flow from pump. Replace as required.
BOOM CHATTERS WHEN EXTENDING OR RETRACTING
Lubricate the boom sections and sheaves per the lubrication directions. Check the wear
pads for proper adjustment and wear.
BOOM DOES NOT SEQUENCE PROPERLY
Adjust the Extend/Retract boom cables per the manual.
WINCH LIFTS LOAD, BUT HAS NO CONTROL ON LOWERING OR HOLDING
THE LOAD

Excessive back pressure on the brake causing it to partially release: Back
pressure must not exceed 150 PSI. Check the pressure on the return line and
remove any restrictions if pressure is too high