M
AINTENANCE
& I
NSPECTION
C
HAPTER
9
9-30
THP 94/42 R 4 XXT
THP 125/42 R 4 XXT
THP 140 H/42 R 4 XXT
GB-07.2005
DANGER
9.9.2
Changing the conveying piston
•
Turn a hardened conveying piston by 180
°
after 2 mm wear (4 mm on the diameter); turn a chromium plated
conveying piston by 180
°
when the chromium plate layer is 30
µ
m.
DANGER:
墌
When working in the wash-out tank always switch off the engine and
take out the ignition key.
墌
Never reach your hands into the wash-out tank when the engine is
running.
墌
Always actuate the hydraulic cylinder by actually actuating the valves
(see section 7.5.4.3) at a low engine speed and reduced stroke rate.
1.
Drain the water tank and remove the protective grill.
2.
Actuate valves Y3 and Y4 to move one drive cylinder to
the end of its travel.
3.
Remove hose clip (
2
) and snap coupling (
4
).
4.
Push the conveying piston (
1
) about 5 mm towards the
conveying cylinder by levering with a pry bar, and
remove the spacer (
3
).
1
2
4
3
Fig. 9.26 Changing the conveying piston 1
3
1
Fig. 9.27 Changing the conveying piston 2
