15
4
CYLINDERS
DISASSEMBLY AND ASSEMBLY
4L0AX00CYLINDERS
Inspection after assembly
No load operation test
1. Place the cylinder in a horizontal position with no load.
2. Apply gentle pressure alternately to the ports at both
ends, operating the piston rod 5 or 6 times.
3. Make sure there is no abnormality in the operating con-
dition.
Leak test
External leak
1. Apply test pressure for 3 minutes each to the retraction
sideandtheextensionside.
 2.Makesuretherearenoabnormalitiessuchasexternal
leakage or permanent deformation, etc. in the rod seal,
the rod cover mount, or in any welded portion.
Internal leak
 1.Disconnecttheextensionsidehose.
2. Apply test pressure to the retraction side for 3 min-
utes.
3. Measure the amount of oil that has leaked from the
extensionside.
• Theamountofleakageshouldbe1mL(0.034.oz)
/3 min or less.
Bleeding air from the hydraulic cylinder
Bleed the air out of the cylinder when the cylinder is re-
moved or when the hydraulic piping, etc. is disconnected.
 1.Starttheengineandletitidleforapproximately5min-
utes.
 2.Withtheenginerunningatslowspeed,extendandre-
tract the cylinder 4 or 5 times.
• Movethepistonrodtoaposition100mm(3.94in.)
before the end of the stroke, being careful not to
relieve air.
3. With the engine at top speed, repeat the operation in
(2),thenwiththeenginerunningatslowspeed,move
the piston rod to the stroke end to relieve air.
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