Dynahoe transmission

I own my Dynahoe 190 for about 7 years, my transmission gets worse on slipping as it gets warmer to the point that it barely moves. I changed all the filters and fluid about a year ago, with the newer trans fluid, someone was telling me that i have add oil to it. Is this right? Sorry for asking a dumb question but I love my Dynahoe and was hoping for some help.

If the transmission is slipping then you more than likely have a mechanical problem, not an oil problem. Typically transmission slippage is a result of one of two things. The first is low pump pressure, often caused by a sticking relief valve, or possibly even a dirty suction or pressure filter. Without enough pressure the clutch packs on each gear selection won't have enough pressure to engage fully and therefore will slip.

Then there are seals on the pistons that engage the clutches for each gear selection. If those seals are bad then the oil will bypass casuing low pressure and, once again, slippage due to inadequate pressure.

Lastly there is pure mechanical damage/wear in the clutches causing the slippage. Thing is this wear can be caused simply due to age and the amount of usage causing normal wear until the discs are worn out. Too this wear can be acelerated greatly by any of the causes I listed above because with not enough pressure to keep the discs tight together they will start to slip, and get worse and worse as material wears off during use.

For any of these problems, except the discs just being worn to the point that no amount of pressure will cause them to engage, as the oil gets hotter and thinner the pressure will tend to drop. Like I said before, as the pressure drops the clutches start to slip more and more.

Unfortunatly unless the problem is being caused by, and hasn't progressed past, something pump related (ie clogged filters, etc) than your only fix is a rebuilt/reseal on the transmission. Good luck.

Just curious. What does your Dynahoe have for a trans? I have a huge Pettibone Multihoe that pretty much looks like a Dynahoe. 3-53 Detroit engine and the trans is torque-converter drive with two speeds forward and two speeds in reverse. I don't know what the trans is but assume it's a Clark or an Allison.

No clue what transmission you have, but heres a start. Check out the Yahoo-Finance-Dynahoe forum also. If its the FWD-REV clutch, with a 3 SP ford truck tranny like the 160, your symptoms are worn converter. But the 190 in the URL has a different style Trans.
Wayne
Dynahoe 190 Tranny issues