Vestil AIR-2000 - Manual (Page 4)

rev. 1/25/2013 AIR-2000-AIR, manual.doc
Copyright 2013 Vestil Manufacturing Corp. Page 4 of 10
Foot Pump Operation
Your new cart is equipped with our exclusive 2-speed foot pump. Features of the pump include: 1)
primary pressure relief valve; 2) pressure compensated return flow control valve; and 3) integrated
lowering valve. Bushings, valve components, and seals are replaceable. Contact the factory for
replacement parts.
Pressing down on the pump pedal causes the platform to rise. Depressing the lowering valve will lower
the table at a constant rate of descent. If the platform is overloaded, the pressure relief valve will open
because of excessive pressure buildup in the hydraulic system. When the pressure relief valve opens, oil will
bypass into the reservoir. NEVER change the pressure relief setting. DO NOT exceed the rated capacity of
your lift equipment.
Speed Selection
This pump offers two "speeds". The “low” speed setting produces low volume/high pressure for fine
adjustments to the platform height. The high speed setting produces high volume/low pressure, which
produces the platform rapidly. The operator has the option of selecting the optimum pump speed for the
application at hand. Pump speeds are selected by sliding the "lock collar" (See below) in or out. An
occasional drop of oil will keep the collar working freely.
Procedure for Bleeding Air from the Hydraulic System
Whether your pump is new or recently serviced, the hydraulic system likely contains air. The design of
this pump includes an "air bleed screw" to facilitate removal of air from the foot pump. To remove air from
the system:
1. Check all fittings to be sure they are tight. Confirm that the oil level is adequate, i.e. within 1" of the
top of the reservoir when the lift is in the fully lowered position.
2. With the platform fully lowered, locate the "air bleed screw". Loosen the screw with an approximately
1/2 turn counterclockwise. As soon as you have loosened the screw, slowly depress the foot pedal to force
air out of the pump chamber. Do not let go of the foot pedal. Tighten the air bleed screw to prevent air from
reentering the pump chamber. Repeat the above procedure until the pump chamber is completely filled
with oil and a "spongy" feel is no longer present when the pedal is pressed. If the air bleeding procedure has
been successful, the feel of the pump pedal will be firm through the entire stroke, i.e. hydraulic fluid will
flow during the entire stroke.