Possible Problems And Solutions - KNOVA KN 7400-030 Instrucciones De Operación

LUBRICATION
All moving joints require lubrication often.
Using a grease gun, grease the lift arm pivot
shaft grease fitting until grease appears at
the end of the shift. Oil all lift arm linkages,
front wheel and rear casters.
MAINTENANCE
IMPORTANT: When adding or replacing oil,
always use a quality hydraulic oil. DO NOT
use brake fluid, transmission fluid, alcohol,
glycerine, detergent motor oil, or dirty oil
as improper fluid can cause serious internal
damage to Jack.
To add oil: With saddle fully lowered and
jack on level ground, remove filler plug (see
Fig. 1). Oil should be filled to level of oil filler
plug hole. If low, add oil as needed.
Maintenance and Inspection: The owner
and/or user must maintain and inspect the
jack in accordance with the manufacturer's
instructions.

POSSIBLE PROBLEMS AND SOLUTIONS

P R OBLEM S
Jack not
lift load
Jack not
hold load or
handle rises
Jack not lift to
its full height
Jack not lower
completely
Jack not lift
smoothly or jack
feels spongy
The release valve is not closed. Turn the valve clockwise tightly.
Low on oil. Refill the jack to the correct level oil.
Pump seals and back-up ring is defective. Clean oil passages, replace
seals and renew oil. (Must be serviced by qualified service center)
Discharge ball is not sealing hydraulic system and oil may be dirty.
Manually flush hydraulic system by raising and lowering lift arm by
hand. Open the release valve, as required to raise and lower the lift
arm. Manually raise and lower lift arm.
Low on oil. Refill the jack to the correct level oil.
The hydraulic system is filled with air. Open the release valve, pump
handle rapidly (4) full strokes to purge air, close release valve.
Return spring is broken or linkages binding.
Replace spring if broken. Grease pivot shaft, oil all lift arm linkages.
The hydraulic system is filled with air. Open the release valve, pump
handle rapidly (4) full strokes to purge air, close release valve.
Oil filler plug
Pump
plunger
Fig. 1
Reservoir
SPECIFICATIONS
TECHNICAL DATA
Capacity:
Min. height:
Elevation height:
Maximum height:
Length:
Net weight:
S O L U T I O N S
Oil filler hole
Proper
oil level
Cylinder
KN 7400-030
3,000 kgs.
5-1/4" (133 mm.)
13" (330 mm.)
18-1/4" (463 mm.)
26-13/16" (681 mm.)
30.7 kgs.