Uneven lifting of
fork
Unstable
stretching out and
drawing back of
mast
Lifting roller not
rotating
High noise of
mast
Powerless lifting
or failure of lifting
I. Lifting chains are not well adjusted.
Adjust
both chains
to
consistent
tightness.
I. There are forei
gn
materials (soil, etc.)
Remove forei
gn
material
iamming on the slide rail.
2 .. There is fouling between the moving
Remove forei
gn
material
parts.
Apply grease on the contact surface
3. Lubrication is insufficient.
of slide guide.
I. Grease is hardened or roller is stuck by
Clean and lubricate the roller
fouling
2. The lifting roller is wrongly adiusted.
Adiust
I. Lubrication is insufficient.
Lubricate
2. Upper roller and Side roller on fork
carriage is
unevenly
adjusted,
which
Adjust the adjusting shims of rooler
descends to hit against the mast channel
and side roller.
when the mast stretches out.
I. Oil pump gear and pump casing are Replace the wear-out parts
or oil
overworn, resulting in big gap.
pump.
2. Piston seal of lifting cylinder is worn,
Replace with new Y seal ring.
resulting in inner leakage.
3. Springs of mutltiway valve and safety
Change new spring
valve are out of order.
4. Control lever of multiway valve and the
valve body are worn, resulting in too much Change
oil lekage.
5. There is oil leakage among multiway
Reassemble
and
tighten
the
bolts
valves.
after grinding.
Compress the union nuts. Check the
6. The hydraulic lines leak oil.
seal gasket and coupling nuts for
damage.
Replace the unqualified hydraulic oil
7. Hydraulic oil is of high temperature and
or stop to lower the level of oil
insufficient capacity, and it is also thin.
capacity. Examine the reason of high
oil temperature.
8.0vcrload
Lift as required.
119
VII. Electrical System
7.1 Overview
The forklift electrical system is negative-earth single-lfoe circuit. It consists of power
supply circuit, start circuit, charging circuit, instrument circuit and lighting circuit. The electricity is
supplied by 12V power supply (battery and generator set form the power supply), each guide line of
electrical function is distinguished by different colors.
7 .2 Inspection
Before operating any components of electrical system, all the start switch shall be in OFF
position, then disassemble the battery positive cable. Each electrical system components of the whole
truck wire harness use different colors of electric wires to distinguish each other during repair process.
Refer to electrical principle diagram to check all the circuits, and use regular testing light or universal
meter to carry out the continuity or short circuit test. Before the test, you shall confinn:
Link every connector finnly without rusting and dirt.
The surface layer of every electric wire shall has no cracks, ageing or other damage.
Fix all the electric wires on the right binding post or connector.
7 .2.1 Lighting System
Item
specification
headlight
12V-55W
Front signal light
LED
Rear combination light
LED
7 .2.2 Preheat Start Switch
check the continuity of switch line by universal meter (set ohm) when the switch is at all places
120
Ranko R55 Forklift
Operator's Maintenance Manual
Common Faults & Solutions
Ranko R55 Forklift
Operator's Maintenance Manual
Common Faults & Solutions