jcb JS210 Service Manual

5 - 3
Section F
Transmission
9803/6400
Section F
5 - 3
Issue 2*
Motor/Gearbox
Fault Finding (continued)
Relief Valve
Fault Possible cause Countermeasure or remedy
1. Motor does not 1. Relief valve closing incorrectly. Completely remove foreign matter, repair
run or rotation 1) Foreign matter is clogging damaged part and reassemble after
speed is slow. components. cleaning. Replace if damage or leakage is
excessive.
2) Spring is broken Replace the spring. Completely remove
foreign matter, repair the damaged part and
reassemble after cleaning. Replace if
damage or leakage is excessive.
2. The cracking pressure of relief valve Replace relief valve sub assembly.
is low.
1) Spring is deformed After cleaning, reassemble.
2) Poppet orifice is clogged
2. Motor does not 1. Relief valve closing incorrectly. Completely remove foreign matter, repair
stop or stops 1) Foreign matter is clogging damaged part and reassemble after
slowly. components. cleaning. Replace if damage or leakage is
excessive.
2) Spring is broken. Replace the spring. Completely remove
foreign matter, repair the damaged part and
reassemble after cleaning. Replace if
damage or leakage is excessive.
2. The cracking pressure of relief valve Replace relief valve sub assembly.
is low. After cleaning, reassemble.
1) Spring is deformed.
2) Poppet orifice is clogged.
3. Excessive shock 1. Shockless function does not work. Completely remove foreign matter, repair
when travel is 1) Foreign matter caught up in damaged part and reassemble after
stopped. shockless piston section. cleaning. Replace if damage or leakage is
excessive.
2) Spring is deformed. Replace the spring. Completely remove
foreign matter, repair the damaged part and
3) Relief pressure set too high. reassemble after cleaning. Replace if
damage or leakage is excessive. Readjust
the relief valve set pressure.
*

jcb JS210 Specifications

General

Brand	jcb
Model	JS210
Category	Excavators
Language	English