PRONAR ZEFIR 85, Servicing Instruction

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PRONAR
E. WORKING WITH THE TRACTOR
PRONAR
41
Connecting one-way servomotors
One must put the plug of the one-way servomotor’s cord into feeding quick-coupler A, B or C (Fig. E-20)
making sure that it is set properly. Check whether the pipe is loose enough when turning the tractor and the
tool in both directions. Actuate the control lever in order to feed the oil under pressure, which ends the
process of conjugation of hydraulic systems of the tractor and the tool.
In order to draw out one-way servomotor, one must pull the lever steering with quick-coupler onwards in
„lifting” position. In order to stop the servomotor before it is completely drawn out, pull the lever into neutral
position.
In order to draw back the one-way servomotor, pull the lever backwards into „lowering” position. For the
section “C”, having the floating position, we lower the servomotor in floating position.
ATTENTION:
One must not hold the lever in „lifting” or „lowering” position when the outer servomotor
reaches the end of its stroke, because it will cause the overflow valve „beat”. Pumping oil through overflow
valve makes the oil gets overheated, which could lead to hydraulic system failure.
Connecting two-way servomotors
In case of connecting two-way servomotors, to the pair of quick-couplers A-A1, B-B1 lub C-C1 (Fig. E-
20) , one must put the plug of feeding pipe of two-way servomotor into left feeding quick-coupler, and the plug
of reverse pipe into right seat of a pair of quick-couplers designed for taking two-way action, making sure it is
properly set. Check whether the pipe is loose enough when turning the tractor and the tool in both directions.
Actuate the control lever in order to feed the oil under pressure, which ends the process of conjugation of
hydraulic systems of the tractor and the tool.
Before setting about working with the machine, check whether moves of the machine
assembly driven by external hydraulic system correspond with moves of the lever. In
case they do not corresponf with each other, one must switch the coupling points of
pips in the pair of quick-couplers.
In order to draw the two-way servomotor out, one must pull the lever steering with quick-coupler forward
into „lifting” position.
In order to draw the two-way servomorot back, pull the lever backwards into „lowering” position.
ATTENTION: One must not hold the lever in „lifting” or „lowering” position when the outer servomotor
reaches the end of its stroke, because it will cause the overflow valve „beat”. Pumping oil through overflow
valve makes the oil gets overheated, which could lead hydraulic system failure.
Disconnecting the hydraulic piping from quick-couplers
In order to disconnect the hydraulic pipe, one must hold it with one hand near the coupling, and put
the other hand on the coupling and pull rapidly. In order to disconnect or connect quick-couplers, one must
reduce the pressure in the hydraulic system. For this purpose, with the engine running place the machine
into neutral position (servomotora are put away). It will cause pressure fall. Stop the engine at levers in
„neutral” position. You can set about connecting and disconnecting couplings at minimum pressure and at
minimum effort.
Before setting about disconnecting servomotors or tool, make sure that equipment and
tool is safely supported.
It is forbiden to work with the tractor with overdriven lever of the divider in lifting or
lowering position without the machine. In this position the oil flows into the tnk through
overflow valve, which causes the oil gets overheated rapidly, which may lead to
external hydraulic system failure.