MAINTENANCE
97
Phase displacement of the boom
Before operating, check the phase displacement of the
telescopic boom extensions: if a certain phase
displacement is ascertained, solve the problem by
acting immediately on the extensions closure command
until the boom is retracted completely.
A misalignment greater than 50 mm involves risk of
breakage of the hydraulic pipes inside the boom.
Transmission belt
Work on the transmission belt only with the engine
stopped! After repairs, make sure all the protection
devices have been refitted and that no tool has been
forgotten on the engine.
Checking the belt tension
To check the tension of the belts, lower the arm of
indicator
1
in the tester.
Place the guide
3
between two pulleys on the V-belt
2
.
At this point, the stop must be on the side.
Press button
4
in the right corner with respect to V-
belt
2
uniformly until the spring clicks audibly.
Lift the tester gently, without modifying the position
of the indicator arm
1
.
Read the value measured on the intersection point
(arrow), scale
5
and indicator arm
1
.
Correct the tension if necessary and repeat the
measurement.
The belt tension tester can be ordered through the
Customer Service.
Replacement
1
screw -
2
screw -
3
screw -
4
adjuster wrench.
To replace the transmission belt:
-
loosen the screw and lock nut,
-
move the generator above the adjuster wrench in
direction
B
until the belt slackens,
-
remove the belts and fit the new ones,
-
reposition the generator above the adjuster wrench
in direction
A
until the belt tension is correct,
-
check the belt tension:
▪
pre-tensioning 650 ± 50 Nm
▪
correct tension 400 ± 50 Nm
-
tighten the screw and lock nut.
Tightening torque:
screw
1
30 Nm
screw
2
42 Nm
screw
3
30 Nm
Engine oil
Do not operate with the engine running!
Do not smoke or use naked flames!
Danger of burns!
During operations on the lubricant oil system, ensure
utmost cleanliness. Thoroughly clean the area around
the components involved from time to time.
Dry the damp parts with air jets. For handling
lubricant oils follow the safety directives and specific
local standards.
B↔A
Summary of Contents for RTH 4.18
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Page 27: ...SECTION ON PRODUCT INFORMATION 27 DIMENSIONS RTH 4 18 RTH 5 18 ...
Page 28: ...28 SECTION ON PRODUCT INFORMATION RTH 5 21 RTH 5 23 ...
Page 29: ...SECTION ON PRODUCT INFORMATION 29 RTH 5 25 RTH 6 21 ...
Page 30: ...30 SECTION ON PRODUCT INFORMATION RTH 6 23 RTH 6 25 ...
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