Terex Genie GTH-4017 EX Service Manual page 140

Section 5 - Problems-Causes-Solutions
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PROBLEMS CAUSES SOLUTIONS
Problems
The booms swings when moved
out
The boom moves hardly in when fully
extended and horizontal
The rear axle unlocking device
doesn't work
14
Causes
Safety valves of the main valve damaged
or dirty.
One-way valves dirty or damaged.
Block valves damaged.
Hydraulic line defective.
Pads worn.
Poor lubrication of the boom.
Paint or abrasion on the pad sliding rail.
Pads worn.
Cylinder damaged.
Block valve damaged.
GTH-4017EX GTH-4514EX GTH-4013EX
November 2008
Solutions
Check the efficiency of the safety valves
fitted to ports A and B of the module;
re-calibrate or replace.
Remove and clean the valve; check its
seal and replace if necessary.
Remove and clean the valve; check its
seal and replace if necessary.
Check and replace any damaged or
restricted hose.
Check the pads for wear and replace
if necessary.
Smear the sliding zone of the pad with
the grease recommended by Terex.
Grind out any signs of abrasion on the
boom and polish the sliding area of the
pad, then smear with grease.
Carefully check all of the front and rear
pads of the boom; lubricate with the
grease recommended by Terex.
Change the seals and check the
tightness of the cylinder.
Remove and clean the valve; check its
seal and replace if necessary.
Document 57.0009.0427