Trouble Shooting; Hydraulic Circuit - AJ BOOST Gebrauchsanleitung

8. TROUBLE SHOOTING

If the truck has malfunctions follow the instructions, mentioned under chapter 7.
Table 2: Trouble shooting
No. Symptom
1 Forks don't raise, don't raise fully, or
raise slowly
2 Forks don't lower or don't lower
fully
3 Forks lower without putting the control
lever in the "lower" position
4 Oil leakage

9. HYDRAULIC CIRCUIT

Fig.5: Hydraulic diagram
1 Safety valve
2 Oil tank
3 Cylinder
4 Valve
5 Valve
6 Pump
7 Valve
8 Lever
Possible Causes
a) Low hydraulic fluid level or impurities in oil.
b) Control lever is out of adjustment.
c) Load is too heavy. Overload release valve is being activa-
ted.
d) Temperature is too low and the hydraulic oil has become
too thick.
e) Air in the hydraulic oil.
a) Obstacle located under truck, in fork mechanism, etc.
b) Control lever is out of adjustment.
c) Fork was left in a raised position for an extended time
causing exposed piston rod to rust.
d) The piston rod or pump is deformed due to over-loading or
uneven loading.
a) Oil impurities are preventing the release valve from fully
closing.
b) Some hydraulic components or seals are cracked or worn.
c) Control lever is out of adjustment.
a) Worn or damaged seals
b) Other cracked or worn parts
6 | 01-2811700 • ajproducts.ie
Corrective action
a) Add approved hydraulic fluid or change oil as
noted in chapter 7.
b) Follow the procedure for adjusting the control
lever in chapter 4.
c) Reduce load.
d) Move truck to a warmer location.
e) Deaerate the hydraulic pump. (see chapter 7)
a) Use caution removing the obstacle.
b) Follow the procedure for adjusting the control
lever in chapter 4
c) Keep fork in the lowest position when not in
use and keep piston rod well lubricated
d) Replace the piston rod or pump
a) Drain and replace hydraulic fluid with appro-
ved fluid as noted in chapter 7.
b) Inspect and replace components as needed.
c) Follow the procedure for adjusting the control
lever in chapter 4
a) Replace seals
b) Replace damaged parts