3-21
C4 - OUTER JIB CHAINS
CLEAN - GREASE - CHECK
MT 1840 E3
CLEAN AND GREASE
- Set the lift truck on its stabilizers, with the jib horizontal.
- Fully extend the telescopes.
- Protect the underside of the telescopes.
- Wipe the chains on the outside of the jib 1 (fig. C4/1) with a clean, lint-free
cloth, then examine them closely so as to detect any signs of wear.
- Vigorously brush the chains to get rid of any foreign matter, with a hard
nylon brush and clean diesel fuel.
- Rinse the chains by means of a paint brush impregnated with clean diesel
fuel and dry them with a compressed air jet.
- Lightly lubricate the chains (see: 3 - MAINTENANCE: LUBRICANTS AND
FUEL), and perform a number of telescoping movements to check the behaviour of the chains.
In case of technical faults, consult your dealer.
CHECK THE TENSION
- Fully extend the telescopes, then retract the jib 200 mm.
- At the centre of both telescopes (T1) and (T2) (fig. C4/2), use a ruler to
measure the perpendicular distance between the top of the telescope and
the underside of the chain (fig. C4/2), this distance must be identical for
both chains.
Telescope (T1): between 117 mm and 97 mm
- If necessary, adjust with the tensioners 2 (fig. C4/3).
- Loosen the locknuts 3 (fig. C4/3), tighten nut 4 (fig. C4/3) until the required distance is
obtained.
- Retighten the locknuts 3 (fig. C4/3) while restraining the nut 4 (fig. C4/3).
Telescope (T2): between 85 mm and 65 mm
- If necessary, adjust with the tensioners 5 (fig. C4/4).
- Loosen the locknuts 6 (fig. C4/4), tighten nut 7 (fig. C4/4) until the required distance is
obtained.
- Retighten the locknuts 6 (fig. C4/4) while restraining the nut 7 (fig. C4/4).
These checks are important for the proper operation of the jib. In case of technical faults, consult your
dealer.
If the chains are too long to allow tension to be adjusted, replace them in pairs. If one of the chains is
broken, replace the chains in pairs also.
C4/1
1
1
C4/2
T1
T2
C4/3
2
2
33
4
4
C4/4
5
5
6
6
7
7
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