YT Crane boom does not retract or retracts slower Cause and Remed

Symptom
The reason
Remedy
jib cranes Boom does not retract or retracts slower
1. The main arm deformed
Repair or replacement
2. Insufficient amount of grease on
Fully apply grease on the sliding surface
3. Improper adjustment slider
Adjustment
4. Telescopic cylinder rod bent or stuck piston in the cylinder
Repair or replace the fuel tank
5. Balancing valve stem, piston clip into the dust, oil impurities blocking the orifice
Cleaning Maintenance
6. The 5 ton pillar jib crane pressure relief valve is too low
Check and adjust
7. Boom elevation is not enough
Erected boom