5
OPERATION
WARNING:
ALWAYS monitor pressure, load or position using suitable equipment. Pressure may be monitored by means
of an optional manifold and gauge (contact BVA Hydraulics). Load may be monitored by means of a load cell and digital
indicator. Correct application position can only be determined by the operator of the equipment.
1. Check all system fittings and connections to be sure they are tight and leak free.
2. Check the engine oil level. Please refer to engine owner's manual.
3. Before starting the pump, always place the control valve lever in the middle (Neutral/Hold) position to prevent accidental lifting
or moving of load.
4. To start engine, refer to engine owner's manual.
5. Let the pump idle for a few minutes before put into operation.
6. Use the control valve lever to control the direction of fluid flow. This gas engine pump is equipped with a 4-way 3-position valve.
Refer to figure 3(a) below for the flow path.
NOTICE:
Do not continue to operate pump after cylinder plunger is fully extended or retracted.
7. To stop the engine, refer to engine owner's manual.
8. Depressurize all connections before disconnect.
NOTICE
:
Control valve on this pump is 4-way, 3-position valve type, for use with double-acting cylinders. If your application require
a 3-way setting for single-acting cylinder as shown in Figure 3(b), it can be changed by an authorized BVA Service Center. If you
have any doubt, please contact BVA Technical Service 888-332-6419.
MAINTENANCE
1. For gas engine, please refer to engine owner's manual.
2. Inspect hoses and connections daily. Replace damaged components immediately with BVA Hydraulics replacement parts
only.
3. Tighten connections as needed. Use non-hardening pipe thread compound when servicing connections.
4. Check hydraulic oil level every 40 hours of operation. Add hydraulic oil if necessary.
5. Completely change the hydraulic oil every 300 hours of operation. Change the oil more frequently when pump is used in an
extremely dusty environment or when the oil has been overheated. Use only good quality hydraulic oil. We recommend BVA
Hydraulic oil, Mobil DTE 15M or equivalent.
Adding Hydraulic Fluid
1. Make sure engine is OFF.
2. Depressurize and disconnect from application.
3. Remove oil cap located on top plate of reservoir.
4. Use a funnel to fill reservoir to about 2" from top of reservoir plate.
5. Wipe up any spilled fluid and reinstall the oil cap.
!
Position 1: Pressurized oil
flows to port A, port B returns
flow to reservoir
Position 3: Pressurized oil
flows to port B, port A returns
flow to reservoir.
Position 2: Neutral, ports
A and B are closed. Hold
Position.
Port A Port B
Port A Port B
Port A Port B
P R
P R
P R
(a) 4-Way, 3-Position Valve for Double Acting Cylinder
Position 1 (Advance): Pres-
surized oil flows to port A.
Position 3 (Retract): Port A
returns flow to reservoir.
Position 2 (Hold): Neutral, port
A is closed. Hold Position.
Port A
Port A
Port A
(b) 3-Way, 3-Position Valve for Single Acting Cylinder
P R
P R
P R
Figure 3
- Flowpath of the valve positions
and operations.
Port A
Port B
1
2
3
