Draper TJ3HD/C, Instructions Manual

14

Jack will not hold load.

Oil control valves not 
seating.

1.  Lower the lifting arm, 

close the release valve 
and remove oil filler 
plug.

2.  Place one foot on a front 

wheel and pull the lifting 
arm up to its full height 
by hand.

3.  Open the release valve to 

lower the lifting arm.

Jack will not lift load.
Jack will not lift to its
full height.
Jack pump feels unsteady 
under load.
Jack will not lower 
completely.

Air block.

1.  Open the release valve 

and remove oil filler 
plug.

2.  Pump handle 5 - 10 full 

strokes and close the 
release valve.

Jack will not lift to its
full height.
Jack pump feels unsteady 
under load.

The reservoir could be 
overfilled. 
Low hydraulic oil level.

Check the oil level.
Remove the filler plug, 
adjust to correct level.

Jack pump feels unsteady 
under load.

The pump cup seal could be 
worn out.

Replace the cup seal with a 
new one.

Jack will not lower 
completely.

Air block.
Unit needs lubrication.

Release air by removing 
filler plug.
Lubricate external moving 
parts.

12. TROUBLESHOOTING

PROBLEM

POSSIBLE CAUSE

REQUIRED ACTION

IMPORTANT: Please note all repairs/service should be carried out by a qualified person.

12.1 TROUBLESHOOTING