1. Home
  2. Forums
  3. Maintenance & Troubleshooting
  4. Mast drift and hydraulic schematic

Discussion:
Mast drift and hydraulic schematic

Hi all.
I have a GP25K with a mast drift (lowering) issue.
It happens in all stages of lift. I repacked the secondary cylinders a year ago. This issue came on suddenly in the last week.
I'm suspecting a load holding valve issue, and I have the parts breakdown for the HCV but they don't list a holding valve in the diagram. Anyone have a hydraulic schematic for this unit they can share?
Thanks.
  • Posted 8 May 2019 00:09
  • By Scrid
  • joined 30 Apr'12 - 40 messages
  • Nebraska, United States
Post a ReplyReport this post
Showing items 1 - 2 of 2 results.
Hi Swoop,
Its a Cat GP25K / AT17C90291
I didn't get the mast number but the HCV is a 3way.
I think each section has its own load holding valve.
Parts manual calls it a "poppet". I'll probably have to split the lift section out and inspect the poppet and seat for damage / debris, or a broken spring.
  • Posted 9 May 2019 03:44
  • Modified 9 May 2019 03:44 by poster
  • By Scrid
  • joined 30 Apr'12 - 40 messages
  • Nebraska, United States
Post a ReplyReport this post
whats the truck serial number?
and a mast number, (look on the right hand side about half way down or just under the tilt cylinder yoke mount) it should be stamped there.
  • Posted 8 May 2019 11:31
  • Modified 8 May 2019 11:31 by poster
  • By swoop223
  • joined 23 Mar'12 - 3,692 messages
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Post a ReplyReport this post

Post your Reply

Forkliftaction accepts no responsibility for forum content and requires forum participants to adhere to our rules of conduct. Click here for more information.

If you are having trouble using the Discussion Forums, please contact us for help.

Toyota 02-2TD20
Toyota 02-2TD20 2019
Yokohama, Japan
Used - Sale
Terberg YT222
Terberg YT222 2016
Balling, Denmark
Used - Sale
|
Upcoming industry events …
LogiSYM Platinum Indonesia 2025
November 27, 2025 - Jakarta, Indonesia
Caspian Ports and Logistics 2025
December 9-11, 2025 - Aktau, Kazakhstan
Automate 2026
June 22-25, 2026 - Chicago, Illinois, United States
More Events
Latest job alerts …
Mechanic / Service tech
Oxford Ct, United States
Forklift Mechanic & Electrician
New York Staten Island, United States
View more jobs alerts
Machinery-onQ
Machinery-onQ.com is the one place to source and sell all your new and used machinery.
Find equipment for sale | Add a listing
VISIT
machinery-onQ.com
Machinery-onQ
Toyota 02-2TD20
Toyota 02-2TD20 2019
Yokohama, Japan
Used - Sale
Terberg YT222
Terberg YT222 2016
Balling, Denmark
Used - Sale
|

PREMIUM business

BSL New Energy Technology Co., Ltd
BSLBATT - practical expertise and excellent design in the industrial lithium-ion battery market.
BSL New Energy Technology Co., Ltd
Fact of the week
In March 2002, identical twins in Finland died on the same day in similar accidents within hours of each other. A 70-year-old man was killed by a truck while cycling; hours later, his twin brother was killed by a truck on the same road, about a mile away, before the family had been informed of the first accident.