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How to Complete a PTO Clutch Pressure Test on Your Tractor

Feb. 4 2021 Tractor PTO By Team Tractor Ranch

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We want to help you complete a PTO clutch pressure test on your tractor.

If you do not feel that you understand these steps, or can perform them safely, consult your tractor dealer or local mechanic.  Also always consult your tractor owner’s manual for model-specific information. 

The purpose of this test is to verify that hydraulic pressure in the Power Take Off (PTO) clutch valve is maintained at correct levels to perform work without causing damage to the Power Take Off (PTO) clutch.

Time to get started.

Procedure 

1. Remove the rear left wheel.

  • Make sure to use a suitable lifting device.
  • Make sure to support the rear axle with suitable jack stands.
  • Make sure that the range gear lever is in N (neutral) position. (SA324/424 only.)
  • Make sure that the hydraulic pump is in good condition.

2. To complete this task you will need to purchase the following equipment and tools:   

  • Adapter fitting (3/8")
  • Hydraulic pressure gauge
  • Hose with coupler

3. Warm up the hydraulic oil.

  • Start the engine.
  • Operate the hydraulic system to circulate and heat up the hydraulic oil.
  • The hydraulic oil must be heated up to the normal operating temperature of 140 °F (60 °C).
  • Check for oil leaks.
  • Shut off the engine.


IMPORTANT: Avoid damage.  Do not overheat the hydraulic oil.

CAUTION: Avoid injury.  Escaping fluid under pressure can penetrate the skin causing serious injury.


4. Power Take Off (PTO) clutch valve pressure test.

  • Remove the test port plug from clutch pressure test port (A, Fig.1).
  • Install the following to the clutch pressure test port.

-  Adapter fitting

-  Hydraulic pressure gauge (B, Fig. 1)

-  Hose with coupler


Perform the following procedure.

-  Start the engine

-  Run the engine at 3200 rpm

-  Pull up the Power Take Off (PTO) switch to the ON position

-  Read the clutch pressure on the hydraulic pressure gauge

-  Pressure gauge must be 246.5 - 333.5 psi (1.7 - 2.3 MPa)

-  Push down the Power Take Off (PTO) switch to the OFF position

-  Shut off the engine


Remove the following from the clutch pressure test port.

-  Hose with coupler

-  Hydraulic pressure gauge

-  Adapter fitting


Install the test port plug.

Check for oil leaks.

After the test, apply the sealing tape to the plug to tighten the plug to: 5.8 to 8.7 fl·lbs (7.8 to 11.8 N·m)


A – Clutch pressure test port

B – Hydraulic pressure gauge


WARNING: The clutch pressure test should not exceed 30 seconds to avoid overheating of the hydraulic oil.


NOTE: When the clutch pressure test reading does not conform to the required specification, remove, and repair the transmission.


If you need any further help, or have any questions about PTO tests, tractors, or anything else, please contact your dealer, local mechanic, or call us at 602-734-9944.  Please ask about our current new and used tractor supply.


Team Tractor Ranch - #1 Tractor Dealer in Arizona. We sell and service most major brands of tractors including Yanmar, Kubota, John Deere, TYM, Mahindra, Kioti, Case, New Holland, Massey Ferguson, Ford, Deutz, Case IH, Farmall, International Harvester, Branson Tractors, LS, Shibura, Claas Tractor, McCormick Tractors, Valtra, Solis, YTO, Montana, and Nortrac.