Grove
Published 01-14-2021 Control # 707-01
2-37
TMS9000-2 SERVICE MANUAL
HYDRAULIC SYSTEM
2
10.
Pressurize and cycle the cylinder with hydraulic oil
pressure. Test the cylinder at 20,700 kPa (3000 psi).
Check for proper operation and any leakage. Make
repairs as needed.
OUTRIGGER JACK CYLINDER
Description
The four outrigger jack cylinders (Figure 2-3) each have a
port block bolted to the piston end of the cylinder, containing
a pilot operated (PO) check valve and the extend and retract
ports. For the cylinder to extend oil passes across the PO
check valve in the free flow direction while retracting requires
the PO check to be piloted open by the retract side pressure.
The four outrigger jack cylinders (Figure 2-21) each have a
hollow rod for internal porting. Each cylinder has a 12.7 cm
(5.0 in) diameter bore. A port block is welded to the rod of
each cylinder and a pilot operated check valve is threaded
into each port block.
The retracted length of the cylinder from the end of the barrel
to the end of the rod is 85.3 ±0.30 cm (33.60 ±0.12 in). The
extended length of the cylinder from the end of the barrel to
the end of the rod is 132.8 cm (52.3 in). Its stroke is 47.5 cm
(18.7 in).
A wiper ring in the head prevents foreign material from
entering the cylinder. O-rings and other seals prevent
internal and external leakage.
The cylinder weighs approximately 98.6 kg (217.4 lb).
Maintenance
Disassembly
NOTE:
Any maintenance requiring disassembly of the
cylinders should include replacement of all seals
and rings. A seal kit will supply the required items.
1.
Clean away all dirt from the head. Place protective
padding around the rod near the head to prevent
damaging the chrome. Using a spanner wrench,
unscrew the head from the barrel.
2.
Secure cylinder barrel in a chain vise in the vertical
position with the rod assembly up.
NOTE:
Oil or oil/air mixture may rapidly exit out of the ports
during rod extension. Shield the work area from the
exiting oil.
3.
With the ports open, extend the rod assembly with a
hoist enough to access the top of the head with spanner
wrench. Do not extend completely.
4.
Turn the head counterclockwise with a fitted spanner
wrench until the threads disengage.
5.
Extend the rod assembly slowly until the piston is free of
the barrel assembly. Place the rod assembly horizontally
on a workbench taking care not to damage the surface
of the rod.
NOTE:
Cover the barrel opening to avoid contamination.
6.
Remove the socket head capscrew.
7.
Unscrew the locknut and remove the piston.
8.
Remove the spacer from the rod.
9.
Remove the seal assembly from the outside of the
piston and the O-ring from the inside of the piston.
WARNING
Death or Injury Could Occur!
Do not use air pressure to cycle or pressurize the cylinder.
Cylinder parts could fly apart with explosive force. Use
only a source of controlled hydraulic oil pressure if the rod
is hard to move.
WARNING
Death or Injury Could Occur!
Do not use air pressure to remove the rod. Cylinder parts
could fly apart with explosive force. Use only a source of
controlled hydraulic oil pressure if the rod is hard to move.
CAUTION
Damage Could Occur!
Exercise extreme care when handling or setting down the
rod. Damage to the rod surface may cause unnecessary
maintenance and expense.
CAUTION
Damage Could Occur!
When removing seals and rings, avoid scratching the
grooved and gland surfaces.
Fo
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Reference
Only
