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DAFF 
Bronze Level
Joined: 10 Mar 2011
Points: 6
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 Topic: 840 AC WHEEL LOADER
Posted: 10 Mar 2011 at 5:14pm |
I have been looking to buy a 1970ish AC wheel loader. Everything on the loader seems A1 but the trans. The pressure on the guage is pegged and it will not move untill it warms up to normal operating temps. It seems to be intermittent too. If you turn off the machine and listen for hydraulic fluid draining and restart it everthing will work for a time but the thrans seems to get hot faster than normal. When working the trans will not slip and operates good then will not operate at all for a time untill you turn the loader off.
The pressure guage seems to be all over the pplace while working too. So what do you think ??? I am thinking there is an issue with the selector where the cable linkage goes into the trans. Something is out of sinc or a broken spring???
The fluid has been drained and no burnt smell or metal filings and is toped up to normal levels.
I do not want to get into a machine which needs extensive trans work.
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wfmurray
Orange Level
Joined: 13 Sep 2009
Location: Bostic NC
Points: 1225
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Posted: 10 Mar 2011 at 8:34pm |
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Change the filters.
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DAFF
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Posted: 10 Mar 2011 at 10:18pm |
Not sure if the owner changed them allready??? I will have a look the next time I go look at the loader. Could it be that simple?? I feel the issue is small but at the same time not exactly sure. I would hate to buy a money pit!!!
I think I am going to go with my gut and buy the loader. Is $4000 too much?? Everything else seems rock solid, engine has been rebuilt and only 8100 hrs on the unit.
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Dean/MN
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Joined: 14 Sep 2009
Location: Oak Grove, MN
Points: 740
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Posted: 11 Mar 2011 at 10:47am |
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$4000 for it is a good buy if the trans and all the pins are reasonably tight. A Cat that vintage would go for 20k plus.
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HD16,917H,185,7050,8030FWA,8050FWA
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DAFF
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Posted: 13 Mar 2011 at 7:04am |
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Making an offer today will keep you posted on how it goes. After talking to some people I think the trouble is directly related to flow. Is the trans cooler in the radiator or external on this machine. I was wondering if it might be pluged up??? The previous owner has changed and cleaned the main screen on the drain plug. Are there any filters which might of been missed??
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DAFF
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Posted: 14 Mar 2011 at 7:01pm |
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Got her for $3800 !!!! Tomorrow begins the battle. All I hope for is an EZ victory!!! At least cost effective. Will keep everyone up to date!!
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woodbutch
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Joined: 17 Jan 2010
Location: western kansas
Points: 54
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Posted: 14 Mar 2011 at 10:35pm |
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let's see your new toy!
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DAFF
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Posted: 18 Mar 2011 at 9:12am |
Did some work to the loader over the past few days. Started off by inspecting the fluids and checking the filters. To my surprise the filter on the pressure relief valve was broken sending metal into the trans. The filter had some little medal flakes but nothing too crazy...
Decided to tear into the pump and valve body sommore looking for the broken parts of the filter. At this point I thought for sure they were in the trans scattered in every orfice. To my surprise they all collected in layers at the power valve, thus blocking 95% of the fluid flow. After rebuilding the springs and totally cleaning the valve body I re installed the pump but to have still no motion. In face it is worse than before. This made so sence to me so off it came again seareching for the issue. Took everthing appart again and everything was perfect !!!! So what went wrong????
Just as I was about to give up I see a small circular spring on the top of the trans. Ah ha I thought !!! Turns out to be a seal between the pump and the input shaft without it the pump will not prime.. So here I await for the seal, will be here later this morning. Going to install and hope everthing is A oK. Cross your fingers !!!!
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DAFF
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Posted: 18 Mar 2011 at 9:56pm |
Seal installed ... still no go!!!! Thought to myself what if the fluid is too low. No it can't be that the previous owner just did a complete drain and fill. Well decided to do some digging on how the fluid is measured. 4 gals later and what do you know, my shop has a new opening where the wheel loader sat. It is perfect!!! Even the 3 speeds work.
All said and done it was an $4500 investment!!!
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rayfromTX
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Joined: 08 Jan 2011
Location: TX hillcountry
Points: 5
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Posted: 19 Mar 2011 at 6:01am |
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That is great. Way to stay after it and get it figured out. That's what I love about old stuff.
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