520079
H200
3-15-90
9-4-97A
MAINT. & OPER. INSTR.
VC 520 - VC 6628
SUPERCEDES
TITLE
DATE
SECTION
HOIST MAINTENANCE AND OPERATION INSTRUCTIONS
A. Hoist Unit Lubrication
1. PTO Driven Pump - Tighten and grease (with high quality commercial grade grease) the lube fittings located in
the PTO drive shaft assembly.
2. Lubricate all grease fittings on the hoist unit.
3. Lubricate the rear hinge assembly.
4. The hoist system should be serviced at the same time the truck is serviced, and sooner if the hoist unit is
performing heavy duty service.
5. Pump Reservoir - Shall be filled with the recommended oil per the manufacturer's instructions. Periodically
check the hydraulic fluid and change when the truck engine oil is changed.
B. PTO Pump Operation
With the hoist and body completely installed, cycle the hoist several times to purge the hydraulic system of air.
Operate the hoist system per the instructions in this manual and per the PTO manufacturer's instructions.
WARNING
Do not operate the pump at more than 1000 RPM. Severe hoist system damage could result. The PTO
speed to engine speed is governed by the gear ratio of the PTO drive installed in the truck transmission.
CAUTION
For long service and safety from VC Hoists, it is important that the following procedure be followed each time
the hoist is operated:
1. Engage the PTO from the truck cab and adjust the engine speed to obtain the correct PTO and lift speed
desired.
2. Pull the pump knob out. This will cause the hoist to raise. Refer to Drawing 520078.
3. When the hoist has reached its maximum capacity, the pump will bypass through the relief valve. To
prevent the pump from bypassing, push the pump knob to the center/middle position. Whenever the pump
knob is centered, the hoist will stop moving and hold its position.
CAUTION
Do not allow the pump to bypass for long periods of time, as this will put stress on the hydraulic and
electrical systems of the hoist.
4. To lower the hoist, push the pump knob in.
NOTE
The Venco Hoists powered by PTO drive pumps must be "powered down". Failure to "power down" will
cause the reservoir to overflow.
5. To lock the hoist against the truck frame when it is in the down position, push the pump knob in. When
the pump bypasses, place the knob in the center "hold" position.
6. Disengage PTO from transmission per the manufacturer's instructions.
WARNING
Do not drive the truck without first disengaging the PTO drive shaft. Failure to disengage the PTO drive
shaft may result in severe damage to the pump and pump drive unit.
MANUFACTURING, INC.
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