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  1. C

    Komatsu PC300LC-5 Travel Motor problem

    Dear Vetech63 All o-rings and seals were provided by Komatsu.
  2. C

    Komatsu PC300LC-5 Travel Motor problem

    Dear John C. After reviewing Shop Manual description of the Brake and Safety Valve function of the travel motor, I have the following question. Can a non-functional safety valve, check valve, and counterbalance valve in the travel motor allow the pressure inside the travel motor case to spike...
  3. C

    Komatsu PC300LC-5 Travel Motor problem

    Dear Heymccall: I have not tested the other motor yet, the weather has been bad, maybe Thursday. The shaft seal on the other travel motor is not leaking into the final drive.
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    Komatsu PC300LC-5 Travel Motor problem

    Dear John: I followed the instructions in my Shop Manual (see attached). H.O. and H. mode, engine at high idling, lock pin installed between sprocket teeth and frame, relieve travel circuit.
  5. C

    Komatsu PC300LC-5 Travel Motor problem

    John C. Shop Manual CEBM207077, Section 20 Testing and Adjusting, page 20-7, Leakage of travel motor, Standard Value Max. 20 liters per minute, Permissible Value Max. 40 liter per minute. I will have to send a picture of the page later. It is a job shop and I watched the motor run on the test...
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    Komatsu PC300LC-5 Travel Motor problem

    Tones: The travel motor shaft seal is blowing out toward the final drive.
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    Komatsu PC300LC-5 Travel Motor problem

    John C. I repacked the swivel joint first, none of the seals where broken or coming apart, just thinner than the new seals from normal wear. I replaced the face seals on both travel motors last year, and at that time, I sent the travel motor with the blown shaft seal to be repaired. Hydraulic...
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    Komatsu PC300LC-5 Travel Motor problem

    During the full stall case drain leakage test, the travel motor drain port is open to atmoshpere (no back pressure). The travel motor case drain flow during the full stall case drain leakage test (1 minute duration) was 1 cup, the Komatsu new travel motor standard drain flow is 20 liters per...
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    Komatsu PC300LC-5 Travel Motor problem

    I have a typo in the above post, ...At high speed 33.7 (book standard value 33.3 +/-2 sec) Sorry
  10. C

    Komatsu PC300LC-5 Travel Motor problem

    New Member. I have a Komatsu PC 300LC-5, Ser# A20416, Travel motor type #HMV280ADT. The travel motor blows the shaft seal and pressurizes the final drive. I ran time test, H.O. and H high idling, at low speed 56.4 sec (book standard value 53.8 +/- 3 sec) and at high speed 58 sec (book...
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