AUXILIARY WINCH RELIEF
Check the pressure using the following procedure.
1.
Attach a pressure gauge to the main & auxilary winch test port.
2.
Disconnect and plug the brake line at the piston housing of the auxiliary winch.
3. Restart the engine and run at high idle speed.
4. Winch down and hold the lever in the “lower” position while obtaining a pressure
reading. See chart below for proper settings. If required, adjust the relief at the
auxiliary winch valve. This relief is adjusted in the same manner at the boom relief.
T300-1 MAIN & AUX WINCH SET TO:3500 psi
T500-1 MAIN & AUX WINCH SET TO:3500 psi
T780 MAIN & AUX WINCH SET TO: 4500 psi
SWING RELIEF
Check the swing relief setting by means of the following procedure:
1.
Attach a gauge to swing test port.
2.
Set the swing brake and attempt to swing against the brake with the engine running at
maximum governed rpm. Adjust the swing relief valve, if necessary, per the chart below.
3. The T780 has two (2) reliefs on the diverter valve, one is for Swing/AC/Counterweight
Removal with setting of 3500 psi. The other relief is for outriggers.
T300-1 SWING SET TO:2000 psi
T500-1 SWING SET TO:2500 psi
T780 SWING/AC/C'WT SET TO: 3500 psi
T780 OUTRIGGERS SET TO: 2500 psi
SWING RELIEF ADJUSTMENT
Remove acorn nut from relief valve and loosen lock nut. (See graphic image below for location)
While stalling out the swing motor with swing brake applied at maximum rpm, adjust valve
with screwdriver until proper pressure is obtained; screwing in adjustment screw to
increase pressure setting and out to decrease it.
Re-tighten lock nut and replace acorn nut.
T300-1_T500-1_T780
Service / Parts
480 P/N 12261-683
REVISED: January 2015
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