Advanced maintenance
Primer pump reversing valve
2018-9015-003
03-2015
Step 2: Adjustment
Note!
Check the valve spool before calibrating the reversing valve. In many
cases, calibration is not necessary.
● Connect the hydraulic circuit of the primer pump to the tractor outlets;
● Activate the tractor hydraulic control;
● Close the ball valve (1) to activate the primer pump;
● Remove the cap over the relief valve adjustment (4) and loosen three turns;
● Unscrew the adjustment nuts (5 and 6) to unlock the reversing valve
adjustments;
● Screw completely the reversing valve adjustment screws (7 and 8). Do not
tighten;
● Let the hydraulic oil run inside the valve for at least 30 seconds;
● Screw the relief valve adjustment (4) four turns. The primer pump piston
cylinder will reach the end of stroke and stop;
● Gradually unscrew the adjustment screw (7) until the piston cylinder moves
toward the opposite end of stroke. Tighten the adjustment nut (5). If the
piston cylinder does not move, screw completely the adjustment screw (7)
and redo the steps using the adjustment screw (8) and nut (6);
● Gradually unscrew the reversing valve adjustment (8) until the piston
cylinder moves toward the opposite end of stroke. Tighten the adjustment
nut (6);
● If the reversing valve adjustment (7) is not adjusted, proceed with previous
step for the adjustment screw (7) and nut (5);
● When the reversing valves are adjusted, the piston will stroke continuously;
● Finally, slowly unscrew the relief valve adjustment (4) until the primer pump
stops, then screw 1/2 a turn to set the valve pressure;
● Open the ball valve (1) and deactivate the tractor hydraulic control.
