Full Product Manual

Rev. 1/24/2018 WTJ-4, MANUAL
Copyright 2018 Vestil Manufacturing Corp. Page 8 of 11
Raising and lowering the boom: Refer to “Crane features” & “Operation of Relief Valve” diagrams on p. 7.
The crane includes a manual hydraulic pump to raise and lower the boom.
Raising the boom: Remove the pump handle from its holder. At one end of the handle is a (black) hand grip. Grasp the
handle by the grip. At the other end of the handle are rectangular notches. Slide this end of the handle over the relief
valve. The spring pin will seat into the notches. Turn the relief valve clockwise (to the right) until tight. Now the relief valve
is closed. Once the valve is closed, insert the handle into the pump receiver. Move the handle up-and-down. The pump
piston extends with each stroke of the handle and raises the boom.
Lowering the boom: Rotate the relief valve counterclockwise (to the left) with the end of the handle. This opens the valve.
When the valve opens, the piston retracts and the boom lowers. The boom lowers more rapidly the more the valve is
turned. To slowly lower the boom, carefully turn the valve counterclockwise until the boom begins to lower. To increase
lowering speed, turn the valve farther.
Boom length adjustments:
The telescoping boom can be fastened/pinned in 2 locations (A & B on p. 3). When pinned to the boom at point A, the
boom is short. Lifting capacity of the fixed hook is 2,000 pounds (909.1kg). When pinned to the boom at point B, the boom
is long. Lifting capacity of the fixed hook is 1,000 pounds (454.5kg). The capacity of the winch hook is always 500 lb.
(227.3kg) regardless of whether the boom is in short or long configuration. To adjust boom length:
1. Use the pump to make the boom horizontal/level.
2. Remove the bolt and fasteners (or hitch pin and clevis pin).
3. Grasp the end of the telescoping boom. Move it until the holes align with the holes at either point A or point B.
4. Reinstall the bolt and fasteners (or clevis pin and the hitch pin).
Using the crane:
1. Apply appropriate rigging to the load.
2. Adjust the length of the boom as your application requires. Make sure that the load does not exceed the capacity for the
selected boom length (see pages 2 &3).
3. Loosen the locking bolt to allow the turntable to rotate.
4. Grasp the mast handle and adjust the position of the crane. To avoid/minimize load swing when lifting a load:
a. Lifting with the winch hook: the load center of gravity should be directly beneath the center of the small pulley.
b. Lifting with the fixed hook: the load center should be directly beneath the hook pin.
Side view
Front view
Proper positioning for lifting with winch hook:
Hook/cable aligned with centerline of load (red
dashed line)
Improper positioning for lifting
with winch hook:
Center of small pulley not aligned with
center of load (red dashed lines)
Front view
Mast
handle
Small
pulley
Pump
handle
receiver
Locking
bolt
Vehicle
bed
When lifting with fixed hook,
position load center of gravity
directly beneath fixed hook pin.
Locking
bolt
Side view