Part No. 57.4400.9203 GTH-4016SR • GTH-4018SR
29
March 2010
REV A
Section 3 • Scheduled Maintenance Procedures
CHECKLIST B PROCEDURES
B-7
Block Valves
NOTICE
Genie requires that this procedure
be performed every 250 hours or
quarterly, whichever comes first.
The piloted blocking valves allow to held the load in
position in case of burst of a flexible hose.
1. Load a weight near the maximum payload onto
the boom.
2. Raise the load some centimetres above the
ground (max 10 cm). To check the valve on
the telescope extension cylinder move the
boom to maximum height and extend it some
centimetres.
3. Loosen the oil hoses to the cylinder of which you
are checking the valve with caution.
4. To check the efficiency of the block valves of
the outriggers, lower them to the ground and
unload the weight of the tyres without raising
them. Loosen the cylinder hoses to check the
efficiency of the valve.
During the check, the oil will flow out of the hoses
and the load shall remain blocked in position.
B-8
Tensioning The Boom Chains
(Only for GTH-4018 SR)
To tighten the boom chains, follow the instructions
below:
1. Fully extend the boom
2. Retract the boom by some 20/30 cm.
3. Tighten the chain up to a maximum tension
value of 50 Nm
4. Check that all chains have been equally
tensioned. If not, repeat the operation described
above
5. Lock the chain tensioners by means of a counter-
nut and locknut.
