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8. TROUBLESHOOTING
N° Problem
Cause
Action
1 The forks can’t be
raised up to the
maximum height
The level of hydraulic oil is too low
Add hydraulic oil, see chapter 7
2 The forks can’t be
raised
The level of hydraulic oil is too low
Add hydraulic oil, see chapter 7
The oil contains impurities (for
example water, sand, dust, rust …)
Change the oil, see chapter 7
The nut or screw were tightened too
much, causing the pumping valve to
stay open
Adjust the nut or screw
Air enters the hydraulic oil
Bleed the air, see procedure in
chapter 7
Control lever is no longer adjusted
correctly
Follow the procedure for adjusting the
control lever in chapter 7
Load is too heavy, pressure relief
valve is activated
Reduce load
Temperature is too low and the
hydraulic oil has become too thick
Move truck to a warmer location and
check intended use.
3 The forks can’t be
lowered
The piston rod or pump body is
deformed due to partial loading
slanting to one side or due to
overloading
Replace the piston rod or pump body
The forks were kept in their highest
position for a long time with the piston
rod exposed, resulting in rust and
causing the rod to jam
Lubricate the rod. Keep the forks
in the lowest position when not in
use, and pay more attention to the
lubrication of the rod.
The adjusting nut or screw is not in
the correct position
Adjust the nut or the screw
Control lever is no longer adjusted
correctly
Follow the procedure for adjusting the
control lever in chapter 6
Obstacle located under truck, in fork
mechanism …
Remove the obstacle with caution
4 Leaks
Sealing parts are worn or damaged
Replace the parts, see spare parts list
Some parts are cracked or slightly
worn
5 The forks
descend without
the release valve
being operated
The impurities in the oil prevent the
release valve from closing properly
Change the oil, see chapter 7
Some parts of the hydraulic system
are cracked or worn
Inspect and replace the worn parts,
see spare parts list
Air enters the hydraulic oil
Bleed the air, see procedure chapter 7
Sealing parts are worn or damaged
Replace the seals, see spare parts list
The adjusting nut or screw is not in
the correct position
Adjust the nut or the screw
Control lever is no longer adjusted
correctly
Follow the procedure for adjusting the
control lever in chapter 6
If none of these troubleshooting suggestions or solutions were helpful, please contact your
local dealer or the manufacturer.
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