Storing your login information automatically.

When you select the 'Remember me' option, your login information will be stored on your computer in the form of a cookie. When you visit Forkliftaction.com again, the stored login information will be retrieved automatically and you will not have to submit your login parameters (email address and password) each time you want to visit our members-only pages.

A cookie is a small piece of data that is sent to your browser from a web server and stored on your computer's hard drive. A cookie can't read data off your hard disk or read cookie files created by other sites. Cookies do not damage your system.

Marketplace Business Directory Discussion Forums Spec-Checker Industry News Events Calendar Jobs & Resumes Photo Galleries
Marketplace
Business Directory
Discussion Forums
Home
My profile
Search
Spec-Checker
Industry News
Events Calendar
Jobs & Resumes
Photo Galleries




News service and business centre for materials handlingHOME
Search  
DISCUSSION FORUMS : Forkliftaction.communicate
Forum: Mechanical Troubleshooting
Brand: Caterpillar - Model: GP30
Number of messages: 13

START MESSAGE:
stupidattimes
Alberta, Canada
Any advice would be thankful I have a fork lift that has the forks drop quite quickly to the floor. no external leaks found. rebuilt the control valve with no issues found there either. Any ideas that I can try with again be very thoughtful cylinders have no issues as well

Modified 12 Mar 2010 02:39 AM
by poster.
Reply  Report this message
REPLIES: Sort replies by
mark_l
Georgia, United States
you may wont to check the carriage roller bearings and side roller bearings. sounds like you could have some that are bad. Also, Ive only seen this a few times but make sure the channel is not warped. One other thing, you might want to check chain adjustment

Posted 12 Mar 2010 12:30 AM Reply  Report this message
CLTL
Ontario, Canada
A forklift lift and lower system is pretty straight forward...the only 2 things i could automatically could come up with is that either cylinder packings are dead or oil by passing in the control valve.

I would try putting a guranteed shut off valve between the main control valve and cylinder and completely isolate it the 2.

Posted 12 Mar 2010 05:29 PM Reply  Report this message
stupidattimes
Alberta, Canada
The bearings have been replaced within 1 year and mast rails are slightly worn. I never thought of isolating the rams. I am going to try a shut off valve in the flow line to the rams to see what happens. The way I see it, if the rams still lower the rams are at fault if the don't it is the control valve

Posted 12 Mar 2010 11:53 PM Reply  Report this message
Prentice
Ontario, Canada

I would reseal the lift cylinders

Posted 12 Mar 2010 11:53 PM Reply  Report this message
ryan_c
Queensland, Australia

Piston seals. Lowering cylinders do not always leak oil. Pressure control valve is another option.

Posted 14 Mar 2010 10:21 AM Reply  Report this message
daniel_g
Flevoland, Netherlands
If the cylinder has top return lines, then it is simply a matter of lifting to full height removing the return lines, lowering and then lfting again and see how much oil you get out from the return pipe on the cylinder.  Bearing in mind there should normally be only a small amount of oil and a large amount indicates a leak and will tell you if the cylinder(s) are leaking internally.

Posted 23 Mar 2010 08:27 PM Reply  Report this message
stupidattimes
Alberta, Canada
I have done several tests and the forks fall intermitantly sometimes they hold the weight. I will be doing the inspection that daniel sugested I will keep the posts coming all they way to the fix is done

Posted 24 Mar 2010 11:57 AM Reply  Report this message
CLTL
Ontario, Canada
For the cost of getting a packing kit and to reseal, you might as well reseal them instead of the hassel and the stress and safety. If the control valve isn't bypassing its definitley the cylinder packings

-------------------------
Commercial Lift Truck

Posted 24 Mar 2010 12:01 AM Reply  Report this message
stupidattimes
Alberta, Canada
In a deeper  inspection we noticed in the back of the right lifting ram a large dent like someone wrapped a chain around the mast to pull something causing the leak down. Only saw this damage after pulling out both rams. new ram is now on order. I  thank you all for your much needed assistance

Posted 26 Mar 2010 00:37 AM Reply  Report this message
LOGIC
Ontario, Canada

Just to add a little tid bit happen to me with hyd.system.We had the down drift all the time new valve, packing etc.... the problem cold storage was used 100% we cut with std.hyd oil 20% probem cured
Later...

Posted 25 Nov 2010 00:28 AM Reply  Report this message
StillCAT
Bucharest, Romania

Is your machine direct drive on hidraulic controls (mechanical) or by joystcs and proportional valves?

Posted 9 May 2013 09:26 AM Reply  Report this message
stupidattimes
Alberta, Canada
The machine is direct via levers. I found the ram was damaged at the lower end hidden by a mounting bracket.

Posted 10 May 2013 01:11 AM Reply  Report this message


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

FORUM
DISCUSSION
MESSAGES
NICKNAME
SIGNATURE

FORUMS
©Forkliftaction.com
Forkliftaction Media Pty Ltd
PO Box 1439
Milton QLD 4064
Australia