Cat D5H Series 2 LGP don't have serial number yet

[Wedig]

Hey guys, I have a Cat D5H Series 2 LGP, will not move, tracks are free I know because we have pushed and pulled it with the sprocket shafts pulled, I checked the transmission pump pressure got 15psi at idle, and almost 100psi at full throttle. What is this pressure supposed to be? Also could the filter screen be plugged and do I need to drop the belly pan to take the screen out to clean it? Could anybody help out? Thanks

 

[Nige]

I checked the transmission pump pressure got 15psi at idle, and almost 100psi at full throttle.

Should be somewhere around 350psi High Idle with the oil at normal temp and the transmission stalled against the brakes in 3rd speed.

A Serial Number gets more accurate information.

Also could the filter screen be plugged and do I need to drop the belly pan to take the screen out to clean it?

The suction screen should be inspected and yes you will have to remove a bottom guard to access it.

More of the background story about what happened before the tractor stopped moving altogether might also help.

 

[masterwelder]

Not sure if the 5 is the same as the 4 but on the 4 there is a filter under the floor pan.

 

[pittsburgh cat man]

maybe broken tube in rear housing

 

[TomA]

Not sure if the 5 is the same as the 4 but on the 4 there is a filter under the floor pan.

 

[Wedig]

Thank you guys! Nige, as far as the background on the tractor, the previous owner said it started slowing down gradually over an x amount of time until finally wouldn't pull itself, we were thinking there might not be enough pressure to release the brakes, which obviously is the problem, could that have caused the brake bands to weld to the drums, or whatever is in there? I have no idea what is in there as I don't have a service manual.

 

[masterwelder]

eBay is the best source I have found for used equipment manuals.

 

[Nige]

eBay is the best source I have found for used equipment manuals.

Not necessarily because a lot of eBay sellers are exptremely proud of their used manuals, often pricing them at more than a new one. Apart from that, to identify the appropriate manual needs a machine Serial Number as a starting point.

 

[Nige]

could that have caused the brake bands to weld to the drums, or whatever is in there?

There are no brake bands. The brakes are multiple disc type, spring applied and released by oil pressure.

Why not start with a few basics.?
1. Look at the transmission oil. Does it appear to be clear and bright or dark and cloudy.? Does it smell burned.?
2. Remove the suction screen/magnet assembly and inspect for particles. Take photos of what you find.
3. Remove the transmission filter and cut it open. Inspect the filter media for particles. See this VIDEO. Yes I know it's an engine oil filter but the principle is the same.

 

[masterwelder]

I agree on needing the serial number to obtain the correct manual. Once in hand I have had great luck finding a good used paper manual(s) on eBay. I will say you need to be diligent with the ones that claim to be complete. Most reputable sellers will show a picture of the contents page and corroborate that with photos of each section. As always with anything used, do your homework.

 

[Wedig]

Just got done draining over 30 gallons of transmission oil, checked the suction screen all clear, oil smells good, clear bright oil, should I go with pittsburgh cat man, broken tube? or transmission pump? any other suggestions???

 

[pittsburgh cat man]

With as big of pressure drop as you have it sure sounds like a large leak one question I have when you say near a hundred pound at high idle could it be possible it's around 85 psi witch is primary pressure

 

[pittsburgh cat man]

It might be worth a shot to pull cover at top rear of transmission and see if the load piston plug is still in the pressure control valve

 

[Wedig]

When it's cold it runs just over 100psi, but when it warms up a bit, it won't quite reach 100. It may come down to 85. I don't think so but not sure

 

[Simon C]

When it's cold it runs just over 100psi, but when it warms up a bit, it won't quite reach 100. It may come down to 85. I don't think so but not sure

What pressure of gauge were you using as too high could be out significantly.
Simon C

 

[Wedig]

What pressure of gauge were you using as too high could be out significantly.
Simon C

Like 250psi

 

[Simon C]

That gauge would be good range. Just asking as we are not there.
Simon C

 

[Wedig]

It might be worth a shot to pull cover at top rear of transmission and see if the load piston plug is still in the pressure control valve

What does the load piston plug look like? I'm new to this dozer, sorry

 

[Wedig]

I finally found the serial number 1DD00356 What year is it?

 

[pittsburgh cat man]

About 1986 I'm sure someone can tell you exact date