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2. A pressure gauge can be installed to read the pressure.
4
Preparation for first use
4.1
General
•
Check the equipment for completeness and damage. Do not use the equipment if it is damaged; in
that case contact the Holmatro dealer.
•
Check whether all accessories are available.
•
Make sure the pump is in a horizontal position.
4.2
Check the hydraulic oil usage
CAUTION
Use hydraulic oil with the correct specifications and make sure no dirt or dust enters the
hydraulic tank to prevent damage to the pump and tools.
•
If the pump is used at temperatures above -10 °C:
1. Check the hydraulic oil level.
2. If necessary, add ISO-L HV VG 36 oil. (for VM43L: ISO-L HV VG 15 oil only)
•
If the pump is used at temperatures below -10 °C:
Replace the hydraulic oil with ISO-L HV VG 15 oil because the pump is delivered with ISO-L
HV VG 36 hydraulic oil.
4.3
Check the drive with electric motor
CAUTION
A licensed electrician is required to replace an electrical power connector.
•
Fit the correct electrical power connector, if necessary.
•
Check whether the voltage and power rating of the electrical power is in accordance with that of the
motor. See the specifications on the motor name plate.
5
Operation
5.1
System operation
5.1.1
General
A system is an assembly of a hydraulic pump, hose(s), and one or more tools.
The hydraulic pump displaces hydraulic oil and is capable of building up pressure.
The hose is for transporting the hydraulic oil between the pump and the tool.
The single-acting tool has a hydraulic cylinder containing a piston that can move axially. If the cylinder is
pumped full from the bottom, the pressure builds up beneath the piston so that it is pushed to the
outside. The axial movement of the piston is used directly to a ram or transferred to a spreading or
cutting mechanism. When the oil pressure is released on the pump, a spring forces the piston back into
the cylinder and the oil flows back to the pump.
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