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4.5.2. External hydraulics control.
The spool valve(s) controls the oil flow to the hydraulic equipment found on farm machinery, namely:
single- and double-acting ram cylinders and hydraulic motors.
NOTE:
It is important that the components are checked correctly before the machine or
implement is attached to or operated by the tractor, otherwise damage to the system
may result.
The external hydraulic system quick-release couplers are located at rear end of tractor (1- Fig. 5.13.5)
Hydraulic control is fitted with single spool valve with two quick-release couplers
It is controlled with a lever (6-Fig. 3.2) with two positions corresponding to the quick-release
couplers, as shown below. Depending on joystick position the pressure appears on relevant coupler
Centre position of joystick is the neutral position.
.
WARNING:
!
Before connecting or disconnecting hydraulic hoses at the remote couplers, stop the
engine and relieve the pressure in the circuit by moving the joystick fully forward, fully
rearward, side ways and then to neutral position.
NOTE:
Before connecting remote cylinder hoses, thoroughly clean the connections to prevent
oil contamination. Remote cylinders are operated by oil drawn from the tractor
transmission system. Therefore, always check and replenish the transmission system
oil after remote cylinder equipment has been connected and cycled a few times
If hoses are accidentally disconnected from the tractor during use, clean tip and coupler receptacles.
Hoses can be reinstalled as previously described with minimal loss of oil.
WARNING:
!
Make sure that the oil level in the gearbox is not below the minimum level. Take
special care when cleaning the hydraulic unit on the implement/equipment so as not
pollute the oil in the transmission housing.
In option he external hydraulic control is fitted with double spool valve with four quick-release
couplers
It is controlled with a lever (6-Fig. 3.2) with four positions corresponding to the quick-release
couplers, as shown below. Depending on joystick position the pressure appears on relevant coupler
(for example: at position “1” the oil is fed to coupler 1 and oil return on coupler 2 and vice-versa; at
joystick position “4” the oil is fed to coupler 4 and oil return on coupler 3 and vice-versa. Centre
position of joystick is the neutral position.
