Perform this test to check HST charge pressure. This determines if there is sufficient oil pressure to transmission.
[1] – Park machine safely.
[2] – Lock park brake.
[3] – Remove center closeout panel. See Remove and Install Center Closeout Panel in Section 90, Group 15.
[4] – Remove plug from pressure test port (A).
[5] – Install pressure gauge as follows:
– Assemble appropriate fitting, JTO3017 hose, and JTO3344 pressure gauge in test port.
[6] – Start engine and set throttle at low idle.
[7] – Check and record charge pressure.
[8] – Increase engine to high idle.
[9] – Check and record charge pressure.
[10] – Stop engine and cycle valves to relieve any pressure.
[11] – Install new O-ring on plug.
[12] – Remove gauge assembly from port. Install plug.
[13] – Install center closeout panel.
Results
– Pressure should be to specification and increase as engine speed is increased.
– If pressure is below specification, check charge pressure relief valve for debris or damage.