8-5
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
1. OPERATIONAL CHECKS
FORKS
Measure thickness of root of forks and
check that it is more than specified value.
EX :
˶
=1050mm(41.3in)
1
1
)
(1)
Difference in height
at tip of forks
Set forks in middle and measure
difference in height at tip of forks.
(2)
STD Fork assy Applicable model
20/25BC-7
30/32BC-7
F173796-02
64FG-31020
Standard
45(1.8)
45(1.8)
Limit
40(1.6)
40(1.6)
mm(in)
Most force is concentrated at root of fork
and at hook, so use crack detection
method to check cracks.
(3)
2. MAST
Check for cracks at mast stay, tilt cylinder bracket, guide bar, fork carriage and roller shaft weld.
Check visually or use crack detection method. Repair any abnormality.
Set mast vertical, raise forks about 10cm from ground and check front-to-rear clearance and left-to-
right clearance between inner mast and fork carriage, and between outer mast and inner mast.
Use these figures to judge if there is any play at roller or rail.
Â
Front-to-rear clearance : Within 2.0mm(0.08in)
Â
Left-to-right clearance : Within 2.5mm (0.10in)
Check that there is an oil groove in bushing at mast support.
Set mast vertical, raise forks about 10cm from ground, and push center of lift chain with finger to
check for difference in tension.
If there is any difference in tension, adjust chain stopper bolt.
Check visually for abnormalities at thread of chain anchor bolt, and at contact surface between
chain wheel and chain.
Rotate chain wheel by hand and check for any play of bearing.
1)
2)
3)
4)
5)
B153FK01
D255FK02
equal or below 1200
above 1200
3
6
Model
Fork length
Height
difference
20/25/30/32BC-7
mm
