HYDRAULIC SYSTEM TMS700E SERVICE MANUAL
2-74 Published 01-29-2015, Control # 512-01
9. Place the rod on a clean table.
10. Install the head followed by the spacer, then the piston
onto the rod. Note proper orientation of each
component.
11. Torque the piston 406 to 474.5 Nm (300 to 350 lb-ft).
12. Install the piston setscrews.
13. Apply anti-seize lubricant to the head outer threads.
14. Brush piston seals and head seals with hydraulic oil and
install rod assembly into barrel. Alignment is critical.
Make sure the seals are not damaged during rod
installation. If necessary use a sleeve to cover the seals.
15. Slide the head into the barrel and engage the threads.
Turn the head counter clockwise until the first thread just
passes the engagement point, then turn the head
clockwise until it is hand-tight or fully seated. When the
head becomes tight, use a mallet or dead blow hammer
to knock the spanner wrench an extra 1/8 of a turn.
16. Brush the check valve with hydraulic oil and thread into
cavity. Torque to 135.5 to 149.1 Nm (100 to 110 lb-ft).
17. Install the plugs.
Test
1. Set test stand pressure to 241.32 bar (3500 psi).
2. Attach hose fittings to cylinder.
3. Connect a ball valve to the “test extend” port (marked
“PC” on rod mount) so that the pressure can be released
after testing and is not trapped in the valve. Test cylinder
through working ports with ball valve closed.
4. The cylinder shall be stroked its full length in both
directions to fill it with oil and remove trapped oil.
5. Pressurize to recommended test pressure at each end,
beginning with the rod end for a minimum of 10 seconds
per end. While under pressure, cylinder shall be
checked for leaks at weld, SAE fittings, valve, and all
external static and dynamic seals (refer to Outrigger
Jack Cylinder, page 8-71 for outrigger jack cylinder
Internal Leak Testing). Cycle cylinder completely (retract
and extend) three times under pressure.
6. When testing is complete, relieve pressure on working
ports. Slowly open ball valve on PC port to relieve
trapped oil pressure. Plug the extend port (marked
“EXT”) and retract the cylinder with air using a regulator
at the RET port and a return line connected to the PC
port. Reclaim all oil. Carefully bleed off air pressure once
cylinder is fully retracted.
7. Seal ports with port plugs to prevent contamination from
entering cylinder.
CENTER FRONT JACK CYLINDER
Description
The center front jack cylinder (Figure 2-58) has a 8.9 cm
(3.5 in) bore and is double acting. A port block is welded to
the end of the cylinder rod and a pilot operated check valve is
threaded into the port block. Internal seals are used to
prevent leaks and a wiper ring in the cylinder head wipes dirt
from the rod as it is retracted. The cylinder has a retracted
length of 115.6 ± 0.30 cm (45.5 ± 0.012 in) and an extended
length of 179.1 ± 0.30 cm (70.5 ± 0.012 in) from the center of
the mounting fixture to the end of the ball on the barrel. The
cylinder weighs approximately 42.5 kg (93.6 lb) dry.
Maintenance
Disassembly
NOTE: Any maintenance requiring disassembly of the
cylinder should include replacement of all seals
and rings. A seal kit will supply the required items.
1. Remove all dirt, grease and other contaminants from
around the ports and the head.
2. Retract the cylinder fully to avoid damaging the rod
during removal.
3. Support the base of the cylinder to avoid sudden
extension. Secure cylinder in work area with clamps or a
chain vise to prevent rolling.
NOTE: Excessive wear due to side load or binding is a
possibility. Mark or note the piston and head
relationship to the rod and barrel.
4. Position the rod mount with the ports facing down. Use a
a means of collecting the oil, remove the port plugs and
the check valve and allow cylinder to drain.
5. Support the rod with a hoist sling and pull the rod to full
extension to remove additional oil. Keeping the rod
supported, tap the rod back in 1 inch after all oil has
drained.
6. Place protective padding around the rod near the head
to prevent damaging the chrome during head removal.
DANGER
Do not use air pressure to remove the rod. Use only a
source of controlled hydraulic oil pressure if the rod is
hard to move.
CAUTION
Exercise extreme care when handling or setting down the
rod. Damage to the rod surface may cause unnecessary
maintenance and expense.
Reference Only
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