MTD 27-Ton Manual de servicio descargar pdf (Pagina 34)

3b. Continue closing the needle valve until the

pressure gauge reads 2,000 PSI.

Record

the following:

Engine RPM

Flow meter reading

Pressure reading

Flow from the pressure mode flow capacities

chart.

• Open the needle valve to relieve the pres-

sure and turn off the engine

Interpreting the results:

• A significant difference between the specified and observed pump performance indicates a bad pump.

4. Control valve test

Relieve the hydraulic pressure from the system.

Install the test gauges between the control valve

and the cylinder.

Warm-up the fluid and purge air from the hydraulic

system.

Control returns to the stop position when released

from the extend position.

Control stays in the retract position until the piston

is fully retracted.

4a. Extend the cylinder fully using the log split-

ter control valve.

• As the ram reaches the end of its travel,

pressure will build until the relief valve

opens. Record the following:

Maximum pressure reached.

Relief valve setting from the relief valve settings chart.

NOTE: The relief valve is not adjustable. If the reading does not match what is listed in the chart, replace the

valve. A high reading is a bad control valve. A low reading could be a bad valve or a cylinder leaking

internally.

5. Cylinder blow-by test

5a. Hold the control valve until the ram stops moving.

Record the flow reading.

NOTE: Fluid movement when the ram is fully extended indicates that the piston seals are not working.

NOTE: Seal kits are available to repair leaking cylinders. If the cylinder has mechanical damage it must be

replaced.

Pressure Mode Flow Capacities

Pump Tonnage

GPM/LPM

+ 0.5 GPM

718-04127 21,25 and 27 1.5 (5.6 lpm)

718-04729 27 ton HP

pump

3 (11 lpm)

718-04128 33 3 (11 lpm)

NOTE: If the readings are low, inspect the engine cou-

pler, the keys, set screws and the spider before con-

demning the pump.

Relief Valve Settings

Valve part

number

Tonnage

Relief valve

setting

+100 PSI

718-04706 27 and 33 3400 PSI

(234 bar)

718-04739 21 2700 PSI

(186 bar)

718-04740 25 3200 PSI

(221 bar)

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

www.mymowerparts.com

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