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CAT IT28 WHEEL LOADER-WHILE PLOWING SNOW DEPRESSED LEFT

BRAKE PEDAL TO SHIFT FROM...
CAT IT28 WHEEL LOADER-WHILE PLOWING SNOW DEPRESSED LEFT BRAKE PEDAL TO SHIFT FROM REVERSE TO FORWARD AND NOW LOADER WILL NOT MOVE-CAT TECH TOOK PRESSURE READING AT FILTER HOUSING AND HAD 0 PSI. SAID IT NEEDS TRANSMISSION PUMP-REMOVED PUMP AND FOUND SOME LIGHT SCRATCHES IN HOUSING SO IT GOT REPLACED-CHECKED SUCTION FILTER,CLEAN WITH SOME SMALL METAL SHAVINGS ON MAGNET-REASSEMBLED-REMOVED AIR FITTING ON LEFT SIDE OF TRANS,VALVE INSIDE MOVES SMOOTH-CRANKED ENGINE WITH FILTER OFF UNTIL FLOW COME OUT-INSTALLED FILTER-TEST RAN AND STILL HAVE NO PRESSURE.ASSUMING A PROBLEM WITH NEUTRALIZER.NOT SURE WHERE TO GO NEXT
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Customer reply replied 6 years ago
1988 IT28B
Answered in 34 minutes by:
2/11/2016
Mechanic: Dan, Technician replied 6 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,127
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified

Hi Tom, My name is***** will be glad to try to help. What is the serial number of your machine. It sounds like the neutralizer valve is sticking and holding the transmission in neutral. This should have been the first area that was looked into if the tech knew that it happened right when the left pedal was pressed.

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Mechanic: Dan, Technician replied 6 years ago

Problem 1

The transmission does not operate in any gear.

Probable Causes


  1. The fuse for the transmission shifter is open or the fuse for the transmission shifter is blown.

  1. There is a problem in the electrical circuit. Check ET for active diagnostic codes.

  1. There is low system voltage.

  1. The transmission shift control unit is faulty.

  1. There is low oil pressure.

  1. The torque converter has failed.

  1. There is mechanical failure in the transmission.

  1. The clutch discs and plates are worn too much.

  1. The brake pressure sensor is inoperative.

  1. The parking brake is engaged.

  1. The Machine Security System is active.

  1. The transmission direction and speed control lever and the transmission direction control switch are both in FORWARD or REVERSE.

Are there any faults or warning indicators?

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Customer reply replied 6 years ago
SN 1HF00794
Mechanic: Dan, Technician replied 6 years ago

Click on this link

Troubleshooting

If this an F or a G series?

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Customer reply replied 6 years ago
Mechanical Trans. Shift cables, air line for neutralizerIT28B
Mechanic: Dan, Technician replied 6 years ago

Ok thanks... further back in vintage... Let me see what I can pull up...

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Customer reply replied 6 years ago
ThanksLooks like valve body might be under top cover
Mechanic: Dan, Technician replied 6 years ago

I remember those. I had the pleasure of rebuilding one of those transmissions before. It has been a while...

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Customer reply replied 6 years ago
Going to lose wifi soon,will be back in about 90 minutes
Mechanic: Dan, Technician replied 6 years ago

No problem ... we can follow up as needed.... I will need some time to look some things up...

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Mechanic: Dan, Technician replied 6 years ago

I would pull that valve apart for the neutralizer and look for any gummed up deposits/trash etc causing it to stick. You will likely have to pull up the floor to access it as well as articulate and remove the under cab skirting.....

Let me know

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Customer reply replied 6 years ago
Ok
Customer reply replied 6 years ago
Any valve body pictures available?
Customer reply replied 6 years ago
Is there a plastic ball in the valve body that can wear out?
Mechanic: Dan, Technician replied 6 years ago

Hi Tom. Diagrams require a subscription to SIS or the parts book for your serial number which I do not have but the dealer will likely print out some parts breakdowns for you. I will see what I can do though

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Customer reply replied 6 years ago
Thanks Dan,will be taking it apart tomorrow.
Mechanic: catmastertech, Technician replied 6 years ago
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,043
Experience: Field service technician for CAT 19 years.
Verified

Dan asked for details about this valve. Here are details about the transmission control valve, include cut-away views.

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Mechanic: Dan, Technician replied 6 years ago

Hi Tom, Donnie was able to help with the information you were looking for. Let either of us know if you need any more help.

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Mechanic: Dan, Technician replied 6 years ago

Hi, did you get this resolved?

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Customer reply replied 6 years ago
Still working on it.
Mechanic: Dan, Technician replied 6 years ago

Thanks for the update. Keep me posted.

Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 15,127
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified
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Dan
Dan
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Category: Construction and Road Equipment
Satisfied Customers: 15,127
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Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.

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