Vestil HT-A - Manual (Page 4)

4
HYDRAULIC FOOT PUMP --- TROUBLE SHOOTING GUIDE
TROUBLE SHOOTING
(Read all instructions thoroughly prior to performing any maintenance.)
SYMPTOMS
• Foot pumping action does not raise platform.
• Cylinder slowly drifts downward under load.
• Cylinder pumps up, but will not go down.
REMEDY
Tools required: 3 & 5 mm hex key wrenches
Standard head screwdriver
Adjustable wrench
1) Adjust Release Pedal
(Refer to figure below)
• Loosen setscrew on release pedal. Rotate
pedal counterclockwise until pedal touches
the base. While holding pedal, use hex key
wrench to turn release shaft counterclockwise
to stop. (NOTE: Do not loosen lock nut on
release pedal shaft.) Tighten pedal set
screws. Release pedal.
2) Check Fluid Level
• Remove fill/breather plug.
• Fluid should be filled to 2-2 1/2 inches from
bottom edge of hole when cylinder rod is in
the lowered position. If overfilled, fluid may
seep from fill/breather plug. (ISO #AW-32
ANTIWEAR HYDRAULIC PUMP OIL ONLY.
FLUID MUST BE CLEAN! STRAIN FLUID IF
NECESSARY).
3) Clean Release Valve Assembly
• Remove release valve assembly cap and
clean assembly (shown in exploded view.)
• While assembly is removed, pump foot pedal
vigorously at least five times.
CAUTION: Fluid will discharge from release
valve hole. This will dislodge any foreign
matter from the ball socket. Clear hole of
debris and reassemble release valve and
tighten cap.
• Repeat procedure #2 to refill fluid.
4) Bleed Pump of Trapped Air
• Pump up cylinder at least 4 inches.
While putting pressure on the platform, release bleeder screw until fluid flows free and clear
from behind the screw. Then tighten bleeder screw and release pressure from platform.
Repeat procedure until no signs of air are present. If after following the above procedures
the problem still exists or if unit is leaking fluid, please contact the factory at (260)665-7586.
BLEEDER SCREW
CYLINDER
ROD
FILL/
BREATHER
PLUG
PUMP PEDAL
RELEASE VALVE
ASSEMBLY CAP
OVERLOAD BYPASS
ADJUSTMENT SCREW
3 mm HEX
KEY WRENCH
CCW
MOTION
RELEASE PEDAL
ADJUSTMENT
PRODUCT BASE
PEDAL SET
SCREW RELEASE PEDAL
RELEASE
PEDAL
FLUID FILL
LINE