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Forum:

Mechanical Troubleshooting

Brand: Clark - Model: C500 SERIES

Number of messages: 8

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beebelawn
Arkansas, United States

I've got a c500-y50 the serial number I believe is a y 355 510 2570. I've been having problems with the it pulling, its been progressively getting worse. Checked the transmission fluid and it was pink, so I've changed it a dozen times and still looks the same. I bypassed the cooler on the radiatior thinking maybe water was getting in through there, still no avail. I'm not sure where to start on getting her fixed or even if its worth spending much money on.

Posted 10 Oct 2008 04:09 AM

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edward_t
South Carolina, United States

these trucks have 2 master cylinders, and the left one is an inching circuit that when the slave cylinder leaks, it is possible that the leaked brake fluid finds it's way into the transmission fluid. At first, this will cause no noticeable problem, and in fact, may help the transmission engage because the effect the brake fluid has is to soften the material the clutch plates are made from. If the leak not repaired and fluid is not flushed right away, it eventually will also soften the seals of the transmission, and over soften the clutch plates, so the trans wears out and slips.
Before I went over the edge with it, I would make sure that the left master cylinder has "freeplay" in the shaft that pushes the spool into the master cylinder, when the pedal is released. I would also see if "bleeding" the pressure from the inching slave cylinder (on the left side of the transmission, not easy to get to) gave you a good inching/clutch engagement.

Modified 10 Oct 2008 08:19 PM
by poster.

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philip_faller
Ohio, United States

If the transmission is not pulling you up a ramp or over small bumps, but drives on flat land ok, you need to do a stall test on the torque converter. You also should take pressures of the transmission. It could also be that your inching valve slave cylinder needs replacing.

-------------------------
Transdoc

Modified 15 Oct 2008 12:36 AM
by poster.

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larry_m
Pennsylvania, United States

Yup- probably an inching problem.

Posted 31 Oct 2008 10:37 AM

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beebelawn
Arkansas, United States

Okay, this thing still is going and I'm just now getting back to working on it. I took the inching valve out and it doesnt look so good. I cant remember if we were loosing brake fluid in it or not. How do you go about testing the pressures on the transmission? Is there a way to test the oil in the transmission to see if brake fluid has contaminated it?

Posted 12 Dec 2009 09:19 AM

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edward_t
South Carolina, United States

I know most Cat dealers (and I would expect a bunch other places too) can get you an oil sample lab report for a very reasonable fee, and pretty quick too.
I would most likely just change the trans fluid up front, that would all be part of a "proper repair".
Trans fluid ain't THAT expensive yet, is it? It ought to get changed every couple of years, even if you only run it 30 hours that couple of years.

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webhome = http://forktechs.com
"it's not rocket surgery"

Posted 12 Dec 2009 11:36 AM

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beebelawn
Arkansas, United States

Ive changed it multiple times and it is still pink looking.

Posted 13 Dec 2009 00:54 AM

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philip_faller
Ohio, United States

I wrote to you before you said the transmission fluid is pink. If it's pink then you have a mixure of radiator fluid (water) and transmission fluid. You said that the truck won't go up a ramp then you need to do a stall check. This will tell you if the torque converter is functioning correctly. If the stall test is good then you need to bleed the inchig line that goes to the top of the valve assy. If that does't work call me. Look at my profile and get my number.

-------------------------
Transdoc

Posted 13 Dec 2009 01:23 AM

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