PRONAR ZEFIR 85, Servicing Instruction

Page: 50 / 88

PRONAR
E. WORKING WITH THE TRACTOR
PRONAR
40
EXTERNAL HYDRAULIC SYSTEM
ZEFIR tractors are equipped with external hydraulic system, that enable workign with hydraulic
servomotors of single and dual-action and with hydraulic equipment of constant flow. The system consists of
three pairs of outputs of external hydraulic system, fitted with quick-couplers at the rear of the tractor.
All quick-couplers are controlled by means of levers located inside the tractor’s cab from the right side of
the operator. Next to levers there is a pictogram with symbols of levers positioning.
1
C
A
B
A
B
C
- neutral (stop); - lifting up; - placing down - floating (optional)*
Fig. E-19 Levers 1 and pictograms of controlling the external hydraulic system.
A – lever controlling the first pair of quick-couplers; B – lever controlling the second pair pf quick-couplers; C –
lever controlling the third pair of quick-couplers;
Each steering lever has three aftermentioned working positions:
LIFTING UP – pull the lever forward in order to draw out attached servomotor and lift the tool up
NEUTRAL – release the lever in order to select neutral position and stop attached servomotor
PLACING DOWN – pull the lever backwards, out of neutral position in order to withdraw the servomotor and
lower the tool.
* FLOATING (OPTIONAL) – section C could present floating position as an option. In order to do so, pull the
lever backwards out of placing down position. It allows for free movement of the servomotor in both
directions, thanks to which such appliances as for example the skimming plough, gains the possibility of
copying of the ground surface.
B
A
B1
A1
C
C1
Fig. E-20. Quick-couplers of external hydraulic system
A-A1 – first pair of quick-couplers in the rear of the
tractor; B-B1 – second pair of the quick-couplers in the
rear of the tractor; C-C1 – third pair of the quick-
couplers in the rear of the tractor; A,B,C – feeding
quick-couplers; A1,B1,C1 – return quick-couplers;
When connecting hydraulic piping check its cleannes. By connecting foul pipes you will cause that
impurities will get into the tank of hydraulic system, which could cause (in spite of installed filters) failure of
hydraulic system of the tractor (of pump, distributor, etc.).
Make sure whether oil in servomotors is free of dirt and of appropriate type.