MTD 27-Ton Wartungshandbuch PDF herunterladen (Seite 18)

2010 Log Splitters

The open-center control valve does four things: See Figure 3.6.

1. Regulate:

It regulates fluid pressure.

• If the pressure exceeds a pre-set limit, the relief valve opens, returning fluid directly to the tank.

• In any no-load condition, pressure should not exceed 300 PSI (20 BAR).

2. Forward:

It drives the ram toward the base plate.

• In the forward position, the control valve directs pressurized fluid through the hose to the port at the rear of

the cylinder.

• This drives the piston up the bore, displacing fluid from the shaft side of the cylinder.

• The control valve allows displaced fluid to leave the shaft end of the cylinder through the trunnion, return-

ing to the control valve.

• The control valve dumps displaced fluid back into the tank through the low pressure hose.

3. Retract:

It draws the ram away from the base plate.

• In the retract position, the control valve sends fluid through the trunnion it is mounted to, to the shaft side

of the cylinder.

• This drives the piston down the bore, displacing fluid from the base side of the cylinder.

• The control valve allows displaced fluid to leave the base end of the cylinder through the high pressure

hose, returning to the control valve.

• The control valve dumps displaced fluid back into the tank through the low pressure hose.

• The control lever is held in the retract position by a detent. When the piston bottoms-out, the build-up of

pressure of between 500 and 2,000 PSI forces the valve out of detent, returning it to neutral.

4. Neutral:

In the neutral position, fluid from the pump is dumped directly back into the tank through the low pressure hose.

Relief Valve Settings

Valve part

number

Tonnage

Relief valve

se tti ng

+ 100

718-04706 27 and 33 3400 PSI

(234 bar)

718-04739 21 2700 PSI

(186 bar)

718-04740 25 3200 PSI

(221 bar)

Figure 3.6

Control valve

For Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com

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