HYDRAULIC OIL
Using dipstick, measure oil level, and oil if
necessary.
When changing hydraulic oil, clean
suction strainer(screwed into outlet port
pipe) and line filter(screwed into inlet pipe).
Line filter uses paper element, so replace
periodically(every 6 months or 1000
hours)
6-19
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
1. OPERATIONAL CHECKS
CHECK ITEM
Check visually for deformation, cracks or
damage of rod.
Set mast vertical and raise 1m from
ground. Wait for 10 minutes and measure
hydraulic drift(amount forks move down
and amount mast tilts forward).
·
CCheck condition
- Hydraulic oil : Normal operating temp
- Mast substantially vertical.
- Rated capacity load.
·
Hydraulic drift
- Down(Downward movement of forks)
: Within 100
mm
(3.9
in
)
- Forward(Extension of tilt cylinder)
: Within 5
。
If the hydraulic drift is more than the
specified value, replace the control valve
or cylinder packing.
Check that clearance between tilt cylinder
bushing and mounting pin is within
standard range.
(1)
(2)
(3)
1
1)
2)
Within 100mm(3.91in)
(after 10min)
Standard Under 0.6 (0.02)
mm (in)
(1)
(2)
CONTROL VALVE
Raise forks to maximum height and
measure oil pressure.
Check that oil pressure is 220
kgf/cm
2
.
(3130
psi
)
20L7HS16
20L7HS17
20D7HS18
3)
(1)
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