Yale GDP100MJNPBV110:
Transmission has no pressure

I have changed the torque converter and pump with still no pressure. I removed valve body and cleaned it and replaced. Solenoids are working good pulling in the valves for forward and reverse. Even checked to make sure inching pedal was adjusted correctly. Any other sugesstions?
  • Posted 14 Jun 2013 13:34
  • Discussion started by CClark
  • South Carolina, United States
Learning is a never ending journey. I don't know it all but willing to learn and may help others.
Showing items 1 - 13 of 13 results.
I'm not familiar with your exact model- I assume you have a distributor? There a few things to check:
power voltage to the ignition coil
visual inspection of the cap & rotor
condition of the spark plug wires

The spark should jump at least 1/2" & be bright blue (from the end of the wire to a known good ground source)

Let us know how you make out after doing these checks
  • Posted 14 May 2014 23:30
  • Reply by bbforks
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!
Thank You I did all that was suggested and unit has not acted up yet !!!!!!

Also now it is an L P unit runs rough when trying to power away from a stop.....no power and bucking....have changed plugs but it has very weak spark at wires and plugs............I have changed L P filters and could not find any vacuum leaks
  • Posted 14 May 2014 10:33
  • Reply by davidr
  • Ontario, Canada
DRR
Also you want to make sure the inching cable/linkage is adjusted properly. If it is not adjusted properly it will make the transmission slip or not enguage right.
If I'm not mistaken the Yale trucks have a linkage setup with an adjustable rod. You will need a pressure gauge hooked up while setting it up.
  • Posted 13 May 2014 23:55
  • Modified 13 May 2014 23:58 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
davidr- there is an adjustment in the rod which actuates the brake master cyl. Adjust this rod so there is a slight (1/4") slack between when you push the brake pedal & you feel resistance when it starts to push the plunger in the master cyl.

The plunger needs to get back to its "rest" position to bleed off any residual pressure in the brake hydraulic circuit. The circuit is designed to hold about 7lbs- any more than that & you'll start to have issues.
  • Posted 13 May 2014 23:24
  • Reply by bbforks
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!
well new to this and not knowing where to ask but saw some thing simeral
brake is not returning all the way and disconnects clutch and unit will not move
bleed brake line and all goes back normal for about a day
ser number glp100mcnmsbe088
any help would be greatly apprecialed
unit also start to run rough after getting warm a
but know I have an LP fliter problem
Again thanks for listening
  • Posted 13 May 2014 12:29
  • Reply by davidr
  • Ontario, Canada
DRR
I had another one doing the same thing and changed out the pump after changing the filter, oil,and sump filter. have you tested the pressures for the forward and reverse sides and torque converter pressure? Just a thought.
  • Posted 24 Jan 2014 13:57
  • Reply by CClark
  • South Carolina, United States
Im having the same problem with a GDP090VXNCGV086 changed the oil & filter and cleaned the sump screen swapped pressure sensors still has a code low pressure forward and shuts down
  • Posted 24 Jan 2014 03:48
  • Reply by keith_n
  • Texas, United States
I did that and all is good the truck is working great,transmission is changing good with no slipping. Thanks for your help. I like to learn new things that I did not know about.
  • Posted 19 Jun 2013 07:52
  • Reply by CClark
  • South Carolina, United States
Learning is a never ending journey. I don't know it all but willing to learn and may help others.
:o)

good deal

now that you have pressures and the truck has pulling power i would run the truck through a stall test and see if it is slipping any. If you don't get any slipping during stall test then you should be ok to run it.
  • Posted 18 Jun 2013 21:08
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
Thanks Swoop what you suggested worked great. Found the strainer stopped up.
  • Posted 18 Jun 2013 09:29
  • Reply by CClark
  • South Carolina, United States
Yes changed all the other filters and oil.
  • Posted 15 Jun 2013 00:27
  • Reply by CClark
  • South Carolina, United States
Learning is a never ending journey. I don't know it all but willing to learn and may help others.
Yes used pressure gauges to check all pressures on the valve body like book says. I will pull the sump strainer filter and check and clean it.
  • Posted 15 Jun 2013 00:13
  • Reply by CClark
  • South Carolina, United States
Learning is a never ending journey. I don't know it all but willing to learn and may help others.
pull the sump screen (strainer filter screen) from base of tranny and check that? clean it?
we can assume you changed the main filter?

you are using pressure guage checking pressures at the control valve?
  • Posted 14 Jun 2013 21:17
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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.

Upcoming in the editorial calendar
Latest job alerts …
Dubuque, IA, United States
Louisville, KY, United States
Louisville, KY, United States

PREMIUM business

BSL New Energy Technology Co., Ltd
BSLBATT - practical expertise and excellent design in the industrial lithium-ion battery market.
Movers & Shakers
Linda Häkkilä Linda Häkkilä
vice president, Investor Relations, Konecranes
vice president operations, Elokon Group
President, EP Equipment Europe
Senior vice president human resources, Kalmar