Hydraulics

19.PTO CONTROL VALVE a.Specification of PTO Control Valve

MAKE–ARON

Fluid Temperature–-40ºC to 100ºC

Pressure–16-18 bar b.General Description c.Theory of Operation (Refer Circuit I-4) d.Removal & Refitment of PTO Control Valve

This series of tractors is equipped with Hydraulically operated wet PTO clutch which is controlled by PTO control valve mounted on RH side of tractor below platform. Hydraulic power is taken from the return line of steering unit. The PTO control valve provides actuation pressure of 16-18 Bar in ‘ON’ condition, also it provides lubrication flow to ‘WET PTO Clutch’, synchroniser and spline shaft.

When the PTO ON/OFF button is in ‘OFF’ position all the oil enters through ‘P’ port and leaves through ‘L’ port for the lubrication of ‘Wet PTO Clutch’, synchroniser and spline shaft. Now, when it is put to ‘ON’ position solenoid gets energised and shifts the spool. This diverts part of oil to the PTO clutch cylinder and hence PTO gets engaged.

1.Drain transmission oil completely from the transmission housing by loosening drain plug.

2.Remove PTO pipes connectors and bolts to separate valve.

3.Remove PTO control valve.

Service Recommendation:

It is not recommended to repair PTO Control Valve. PTO Control Valve should be completely replaced, if internal problem is suspected.