Cat Lift Trucks (& Caterpillar) GP50:
No Transmission Pressure. No forward or Reverse

I have a Cat GP50 with two speed transmission and 4.3 engine. Lift will run fine, but will not move forward or reverse. Checked pressure on all three ports on the valve body and there is no pressure whatsoever in any gear. Pulled one transmission cooler hose as well and no movement of fluid either. Removed fill plug and do not see movement of fluid when idling. Lift was moving fine before and fluid shows no signs of metal or discoloration. Forward and reverse on this lift are completely mechanical so there is no solenoids. Torque converter spins fine and nothing visibly wrong from the outside. We do hear what sounds like a faint knock when lift is running. It sounds like it is coming from torque converter area. I have my suspicions, but would like to hear other people's ideas or if anyone has experienced this.
  • Posted 4 Nov 2023 05:22
  • Discussion started by Matt_Cade
  • Tennessee, United States

Post your Reply

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Having trouble using the Discussion Forums? Contact us for help.

Movers & Shakers
Bennit Schmieder Bennit Schmieder
President, EP Equipment Europe
Senior vice president human resources, Kalmar
President, Mitsubishi Logisnext Americas
Chief executive officer, Messe Stuttgart India
Global Industry News
edition #1226 - 17 April 2025
In this week’s Forkliftaction News we wrap up our coverage of ProMat 2025 with a look at some more of the product launches at the Chicago event. We also reveal the new leadership team for Toyota Material Handling North America and which forklift manufacturer has expanded its production from Shanghai... Continue reading
Upcoming in the editorial calendar
MATERIALS HANDLING ATTACHMENTS
Apr 2025
ARTIFICAL INTELLIGENCE
May 2025