jcb JS210 Service Manual

5 - 4
Section F
Transmission
9803/6400
Section F
5 - 4
Issue 1
Motor/Gearbox
Fault Finding (continued)
Double Counterbalance Valve
Fault Possible cause Countermeasure or remedy
1. Motor does not 1. Plunger is not switched Inspect the piping for damage.
run or rotation 1) Pressurised oil from the pilot
speed is slow. not there. Completely remove foreign matter, repair
2) Foreign matter caught between the damaged part and reassemble after
plunger and body. cleaning. Replace if damage or leakage is
excessive.
3) Orifice is clogged. Completely remove foreign matter, repair
the damaged part and reassemble after
cleaning. Replace if damage or leakage is
excessive.
4) Foreign matter caught between Reassemble after cleaning.
dumper piston and cap. Completely remove foreign matter, repair
the damaged part and reassemble after
cleaning. Replace if damage or leakage is
excessive.
2. Motor does not 1. Plunger does not return. Completely remove foreign matter, repair
stop or stops 1) Foreign matter is caught. the damaged part and reassemble after
slowly. cleaning. Replace if damage or leakage is
excessive.
2) Spring is broken. Replace spring.
Completely remove foreign matter, repair
the damaged part and reassemble after
cleaning. Replace if damage or leakage is
excessive.
3) Spring is not assembled correctly. Assemble spring in specified position.
4) Orifice is clogged. Reassemble after cleaning.
3. Rotation varies. 1. Plunger does not return. Completely remove foreign matter, repair
1) Foreign matter is caught. the damaged part and reassemble after
cleaning. Replace if damage or leakage is
excessive.
2) Orifice is clogged. Reassemble after cleaning.
4. Abnormal noise 1.Plunger does not return. Completely remove foreign matter, repair
is heard. 1) Foreign matter is caught. the damaged part and reassemble after
cleaning. Replace if damage or leakage is
excessive.
2) Spring is broken. Replace spring. Completely remove
foreign matter, repair the damaged part and
reassemble after cleaning. Replace if
damage or leakage is excessive.
3) Orifice is clogged. Reassemble after cleaning.
5. Travel not linear. 1. Dumper piston or cap is abnormally Replace dumper piston and cap.
worn. Completely remove foreign matter, repair
the damaged part and reassemble after
cleaning.

jcb JS210 Specifications

General

Brand	jcb
Model	JS210
Category	Excavators
Language	English