Yale GLC060VXNVSE088:
forks drift down after switch is released

can anybody point me in the right direction why the second stage of the mast continues to drift down when the down switch is released. this has electric soleinoids on the control valve.
  • Posted 9 Jul 2020 03:07
  • Discussion started by throttleup
  • United States
Showing items 1 - 9 of 9 results.
We used to put dexron in for trucks run in cold storage. Straight hyd. would get too thick. Seems to me we would go up to about 30% dexron. This was per Clark factory advice at the time.

The shut-off valve sounds like a good way to isolate the problem.
  • Posted 10 Jul 2020 07:47
  • Modified 10 Jul 2020 07:48 by poster
  • Reply by lumberjack
  • Maryland, United States
Put a shut off valve between the main hydraulic supply and the mast. Raise the mast into second stage, shut off truck and valve. This will identify if it is hydraulic or cylinder. Should mast continue to lower it is in the cylinder. If it does not, check for voltage at the solenoid or through the dash display, diagnostics, hydraulics. Look at the lowering voltage. I suspect a phasing issue at the sequence valve block. It stops lowering once the hoist cylinders lower and does not continue, dig into the valve.
  • Posted 10 Jul 2020 03:42
  • Reply by Fishmech
  • Virginia, United States
The hard to do we do right away. The impossible just takes a little longer.
are the cylinders bypassing ?
  • Posted 10 Jul 2020 03:29
  • Reply by stillworkin
  • New York, United States
This just came to me if it was a worn out sport inside the control valve then it would also do it on the first stage it works like a champ on the first stage. Would there just be more pressure when it's up on the second stage with three cylinders pushing down on it as opposed to one
  • Posted 10 Jul 2020 02:52
  • Reply by throttleup
  • United States
Mmmmm I didn't think about checking the voltage thank you so much. Also if this helps out any I change the hydraulic fluid to a very thick viscosity because it had red fluid which seem like ATF which is very thin and that seem to fix the problem for about six months
  • Posted 10 Jul 2020 02:47
  • Reply by throttleup
  • United States
Only other thing I could suggest is to monitor the voltage across the coil when it's malfunctioning to make sure it's not being told to lower. If you can determine that there is no diode suppression inside the coil, you might try switching polarity to the coil.
  • Posted 10 Jul 2020 02:38
  • Reply by lumberjack
  • Maryland, United States
You may also have a spool valve that is not completely returning to stop or worn out allowing fluid to bypass loosing hold pressure.
  • Posted 10 Jul 2020 02:31
  • Reply by Lenthetech
  • Alberta, Canada
No the forks continue lowering. There are two solenoids on top of the Lift lowering portion of the control valve I did swap those and the problem still is there
  • Posted 10 Jul 2020 02:16
  • Reply by throttleup
  • United States
Do the rails continue lowering while the forks remain stationary? If so, the mast isn't staging properly. Innerslide lube and repeated lifting-lowering usually fixes this (in older, seldom used trucks).

If the forks continue lowering just as if the switch was still engaged, then you might have a sticking solenoid. On some old solenoids you could flip the coil and counteract the problem of a magnetized valve body. You could try swapping out the solenoid if you have a sister truck.
  • Posted 10 Jul 2020 01:59
  • Reply by lumberjack
  • Maryland, United States

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

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

IWLEX is a brand-new purpose driven, industry exhibition, conference and community specifically focusing on warehousing and intralogistics, and will be held at the Telford International Centre, Shropshire, England on the 23-24 May 2023.
Tailift has announced the release of their Z-Series lithium-battery electric forklifts! Built specifically to meet the needs of warehouses, distribution centers, and manufacturing facilities.

In the Virtual Expo

ProMat 2023
Touch the future at ProMat 2023. With keynotes, networking, education, and product booths, ProMat is where manufacturing and supply chain innovation comes to life. Visit promatshow.com today.

Inside Forkliftaction

After some pessimism last year, the International Monetary Fund has increased its 2022 and 2023 growth forecasts. Global growth will slow from 3.4% in 2022 to 2.9% in 2023 and then rebound to 3.1%, the global agency predicts.
The IMF is encouraged by the recent reopening of China, which it
...Continue Reading

Inside Forkliftaction

After some pessimism last year, the International Monetary Fund has increased its 2022 and 2023 growth forecasts. Global growth will slow from 3.4% in 2022 to 2.9% in 2023 and then rebound to 3.1%, the global agency predicts.
The IMF is encouraged by the recent reopening of China, which it
...Continue Reading
“…I'm happy to report that we recently appointed an ideal candidate who found us via the Forkliftaction ad. This speaks volumes from my point of view.” - Hamish Clark, President...
Packaging Innovations & Empack, Featuring Contract Pack & Fulfilment, will be held at the NEC Birmingham on 15 & 16 February, 2023, and is free for attendees.

FOR SALE ON MACHINERY-ONQ

Aichi SR123
Japan
Canada Ontario
Netherlands
Netherlands
China

Inside Forkliftaction

After some pessimism last year, the International Monetary Fund has increased its 2022 and 2023 growth forecasts. Global growth will slow from 3.4% in 2022 to 2.9% in 2023 and then rebound to 3.1%, the global agency predicts.
The IMF is encouraged by the recent reopening of China, which it
...Continue Reading

Movers & Shakers

senior marketing manager
Tompkins Robotics, United States
chief digital officer
Wiferion, Germany
director of dealer development
Toyota Material Handling, United States
director of national accounts
Toyota Material Handling, United States