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REPLACEMENT PARTS:
Our company takes pride in using the finest available parts for our equipment. To order parts for your equipment
contact Customer Service at the factory. In any correspondence with the factory please include the Serial Number which
is inscribed on the nameplate of the equipment. Use only the part numbers provided in this Owner's Manual. When
ordering parts for AC power units, please be prepared with the motor phase and the voltage of the equipment.
LOADING INSTRUCTIONS
The capacity of the CB-PMPS appears on label 287 (see p. 23). DO NOT apply a load to the pallet handler that
exceeds the capacity, because personal injury or permanent damage to the handler might result.
When loading the PMPS, always follow these guidelines:
1. The load should firmly contact the upright portions of the forks;
2. DO NOT apply a load to the tips of the forks;
3. Center the load on the forks;
4. Only transport loads in the lowered position.
RESPONSIBILITIES OF OWNERS & USERS:
1.) Inspect and maintain this product in accordance with this manual (see "Inspections & Maintenance; p. 21-22).
2.) DO NOT use the pallet handler unless it is in normal operating condition. Always inspect the CB-PMPS according to
the maintenance recommendations on p. 21-22.
3.) Lift should only be used by trained and authorized personnel. All lift operators must have read and understood all
operating procedures and safety guidelines in this Owner's Manual.
4.) Lift must never be overloaded.
5.) Operator must ensure that all safety features of the lift are functioning properly before each use.
6.) Any modifications to the lift must be approved in writing by the manufacturer.
HYDRAULIC SYSTEM
Pushbutton controls are standard equipment on CB-PMPS series pallet handlers, i.e. a handheld controller as well as
control buttons on the housing of the modular power unit. To raise or lower the fork carriage, press the appropriately
marked button. When either button is released, the carriage will maintain position until the UP or DOWN button is
pressed.
OPERATION:
To raise the forks, press the UP button on the pushbutton controller. This starts the electric motor which turns the
hydraulic pump and oil from the reservoir then flows through the suction filter and into the pump. The pump delivers
pressurized oil to the cylinders through a check valve. The check valve allows oil to flow only in one direction, i.e. to the
cylinders, and prevents oil from flowing back into the pump circuit when the pump stops running. This holds oil in the
cylinders and maintains any particular elevation for extended periods of time.
If the load exceeds the capacity of the pallet handler, when the UP button is activated, pressure will build up in the
circuit between the pump and the cylinders. This pressure forces the relief valve to unseat which in turn allows the pump
flow to circulate to the reservoir. This pressure relief mechanism prevents damage to the hydraulic system and structure
of the pallet handler.
To lower the forks, press the DOWN button. This energizes the lowering solenoid valve coil, which unseats the poppet
valve and allows oil to return to the reservoir from the cylinders through the pressure-compensated flow control valve.
Releasing the DOWN button de-energizes the solenoid and closes the valve poppet. The poppet valve and check valve
together prevent oil from returning to the reservoir and cause the cylinders will stop retracting. The unit will maintain the
particular elevation until the operator presses a button on the pushbutton controller again.
LOWERING SOLENOID VALVE:
The pallet handler is equipped with a cartridge lowering valve. If a malfunction occurs while lowering the fork carriage
(item no. 4, p 4-6) refer to the solutions presented in "Troubleshooting" on p. 21-22. To clean the lowering solenoid, follow
this procedure:
1. Completely lower the fork carriage.
2. Use a sharp object to push the poppet in from the bottom and open the valve.
3. Repeat several times while immersing the valve in kerosene or mineral spirits. Blow dry the cleaned valve.
4. Blow compressed air through the valve while holding the valve open as described in step 2.
5. Inspect the
rings and the PTFE washer (polytetrafluoroethylene). If either component is torn or cut, replace it.
O-
6. Reinstall the valve. The valve should be tightened to approximately 20 ft. Ibs. of torque.
Copyright 2016 Vestil Manufacturing Corp.
rev. 11/1/2016
CB-PMPS, manual.doc
Page 17 of 23
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