General Wreckers Common Problems and Remedy
Percussion drilling is employed when auger or wash boring is not possible in very stiff soil or rock. It also can be used in most soil types.
Here the advancement of a hole is achieved by alternatively lifting and dropping a heavy cutting or hammering bit that is attached to a rope or cable that is lowered into an open hole or inside a temporary casing (casings are hollow cylindrical pipes used for borehole stability and to prevent the loss of drilling fluid through the boreholes).
Usually a tripod is used to support the cable. The stroke of bit varies according to the ground condition. The major disadvantage of this method is that it is not possible to get good-quality undisturbed samples. In very hard rock (and especially fractured hard rock), down-the-hole (DTH) drilling can be employed. In this case the hammer, applying repeated percussive pressure, is located just behind the drill bit inside the hole, unlike the open percussion drilling, where the hammer is on top of the drilling string.
The drilling string provides the necessary force and rotation to the hammer and bit, as well as compressed air or fluids to the hammer and for the flushing of cuttings.
This arrangement also allows for much deeper percussion drilling. However, the DTH drills are typically more expensive.
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1. The lifting speed of the wrecker lifting arm is slow and inefficient
Reasons: 1 hydraulic power system failure   2 telescopic mechanism control valve, overflow valve failure
Method of exclusion: 1 inspection, adjustment   2 Disassemble, clean, adjust or replace damaged components
2 , Wrecker boom extension stretching vibration
Cause: 1 boom slider problem   2 telescopic cylinder is abnormal
Remedy: 1 Insufficient lubrication between the sliding surface of the lifting arm box and the sliding block should be applied grease; slider surface deformation is too large, should replace the slider; lifting arm surface damage, the surface should be repaired 2 check processing.
3 , the length of the boom lifting section of the wrecker cannot be compensated
the reason: 1 solenoid valve failure 2 circuit failure
Remedy: 1 Clean the oil filter, replace the electromagnet 2Check the external line fault
4 , wrecker lift arm automatic retraction
Reasons: 1 telescopic cylinder failure   2 balance valve failure
Remedy: 1 Check, adjust telescopic cylinder, replace damaged components   2 check, adjust the balance valve, replace the damaged components
5 , wrecker lifting mechanism does not move or slow
Reason: 1 vehicle control valve failure 2 hydraulic motor failure 3 balance valve failure 4 lift brake failure
Remedy: 1 Check processing 2 adjust the replacement spring
6. The movement of the wrecker lifting agency is interrupted
Reasons: 1 Check valve failure
Remedy: 1 cleaning, replacement
7. Loss of load control when wrecker is dropped
Causes: 1 Balance valve failure
Remedy: 1 Open cleaning
8 , Wrecker lifting mechanism can not open the brake
Reason: 1 shuttle valve stuck 2 Shuttle valve leaks 3 Bad brake piston seal
Remedy: 1 Repair shuttle valve 2 service shuttle valve 3 Service brakes, replacement seals
9 , rise from the limit, ring the bell does not ring
The reason: â‘ bell damage 2 over coil relay damage
Remedy: 1 Maintenance
10 , wrecker truck cylinder automatic retraction
Reason: 1 cylinder itself failure 2 balance valve failure
Remedy: 1 Check processing 2 open cleaning, replacement of damaged components
11th , wrecker brake cylinder vibration
Reasons: 1 There is air in the cylinder   2 Misalignment of the balance valve or damage to the spool, blockage of the orifice
Remedy: 1 Multiple amplitude action when no load, charge exhaust 2 open, cleaning inspection, replacement of damaged components
12 , Wrecker Lifting Failure
Reasons: 1 bidirectional hydraulic lock failure
Remedy: 1 Check and repair two-way hydraulic lock
13 〠Automatically retract the legs when lifting
Reasons: 1 Unidirectional in a bidirectional hydraulic lock 2 poor valve sealing 3 cylinder internal leakage
Remedy: 1 Check the two-way hydraulic lock check valve 2 inspection cylinder seal on the piston component
14. No movement or slow movement during lifting
Reasons: 1 The hydraulic pump is damaged 2 overflow valve failure 3 rotary joint damage 4 Manual control valve is damaged
Remedy: check repair
15. Oil temperature rises
Causes: 1 Damaged or malfunctioning hydraulic pump 2 Hydraulic oil contamination or insufficient oil
Remedy: 1 Replace or repair     2 should replace or add hydraulic oil
16 , Wrecker hydraulic pump does not rotate Percussion Drilling Rig