MAINTENANCE AND CARE OF THE POWER PACK
MAXIMUM PRESSURE REGULATION
THE "MAXIMUM PRESSURE" AND "CUT-FF" VALVES POSITIONED ON THE SIDE OF THE UNIT (SEE FIG. 2
Pag 7) PERFORM TWO DIFFERENT FUNCTIONS:
• THE "MAXIMUM PRESSURE" VALVE IS THE SAFETY VALVE THAT ADJUSTS AND CONTROLS THE
MAXIMUM PRESSURE OF THE HYDRAULIC CIRCUIT PROTECTING THE TOOLS FROM BREAKAGE OR
EXCESSIVE PERFORMANCE.
• THE "CUT-OFF" VALVE RELEASES THE PRESSURE WHEN IT IS NEAR THE MAXIMUM LIMIT, PREVENTING
THE UNIT AND THE CONNECTED TOOLS FROM OPERATING AT MAXIMUM EFFORT MORE THAN
NECESSARY.
It is very important to respect the pressure maximum value recommended for the tool.
An excessive pressure can cause breakage of the tool and equipment and can cause accidents.
Too low pressure on the tool can cause a decrease in performance and an increase in oil temperature.
The pressure gauge located on the valve top always indicates the pressure used or reached by the
tool during its use.
The "MAX PRESSURE" and "CUT-OFF" valves have been adjusted by TEHMA to the maximum
working pressure that can be accepted by its tools.
Changing the calibration of these valves can pose serious risks for the operator and the
hydraulic equipment, therefore it is advisable to proceed with this intervention only when
strictly necessary and after checking the pressure limits declared by the manufacturers of the
tools to be connected to the control unit.
IN ANY CASE THE MAXIMUM PRESSURE MUST NOT EXCEED 700 bar.
INSTRUCTIONS FOR ADJUSTING THE MAXIMUM PRESSURE
1. Turn on the unit with the lever that controls the distribution valve in the central position (OFF) without
tools or pipes connected.
2. Let the unit run for a few minutes in order to allow the oil contained in the circuit to reach the correct
operating temperature.
3. Loosen the "CUT-OFF" valve locknut (see FIG.2 page 7) and tighten the central screw until a small
pressure is applied to the bottom of the valve.
4. Turn the lever that controls the distribution valve on the channel where the quick couplings are fitted.
The pressure should rise rapidly and reach 650-700 bar.
5. Now is possible to loosen the "MAXIMUM PRESSURE" valve locknut and adjust the maximum pressure
by CAREFULLY acting on its screw.
6. Once the desired pressure has been set, retighten the "MAXIMUM PRESSURE" valve locknut.
7. Then loosen the "CUT-OFF" valve screw until it clicks and the pressure drops from the set value to 50-
100 bar.
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