MTD 27-Ton Instrukcja Obsługi Pobierz pdf (Strona 17)

Hydrualic Diagnosis

The pump draws fluid from the tank, and forces it under

pressure to the control valve.

See Figure 3.4.

• The pump is capable of producing 3,400 PSI (234

bar) at a pump speed of 3,500 RPM.

• The pump is a two-stage pump.

• There is no relief valve in the pump.

• There is unloading or by-pass valve in the volume

circuit.

• The pump is direct-driven from the engine.

• The pump delivers pressurized hydraulic fluid to

the control valve.

Two-stage pumps operate in a volume and a pressure

mode.

In the volume mode both stages are pumping fluid to

the control valve. The volume mode is used to rapidly

move the wedge down the beam.

NOTE: The pressure stage flow is at a much lower GPM

rating than the volume stage, but the pressure is

much higher.

In the pressure mode, the pressure of the fluid from the

pressure stage closes the check valve. The fluid coming

out of the volume stage can not open the check valve and

is diverted to the by-pass valve which will dump the fluid to

the intake side of the pump.

The pressure mode is used to drive the wedge through

the wood that is being split.

Pump By-pass Settings

Pump Tonnage

By-pass Pressure

100 PSI

718-04127 21,25 and 27 500 (34 bar)

718-04729 27 ton HP pump 1000 (69 bar)

718-04128 33 700 (48 bar)

Figure 3.4

Pump

Suction hose

Pressurized line to

the control valve

3RZHUIURP

HQJLQH

6XFWLRQOLQHWRWDQN

+LJKSUHVVXUHOLQH

WRWKHFRQWUROYDOYH

Figure 3.5

Check valve

By-pass valve

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

www.mymowerparts.com

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