I just picked up a dump truck with a winch. It starts and drives good but the pto seeems to work fine to the front for the winch but I can not get it to work to the back for the dump bed. Anyone got any ideas?
The lever to your left behind the parking brake lever is how you control the dump. If that is not working check the linkage to the pto/valve body. Also read the TM's about proper operation.
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The lever to your left behind the parking brake lever is how you control the dump. If that is not working check the linkage to the pto/valve body. Also read the TM's about proper operation.
Yep, that lever runs the dump box hydraulic valve and the rear pto output as well. If it is not working right, there could be some frozen up or improperly adjusted linkage. Let us know how it works out.
Thanks for the help. I did get it to work by adjusting the linkage. Even with new pins there is a lot of play so the adjustment is minimal. The difference in the PTO going in and out and not going in at all or not coming out at all is 3 threads.
I'm having a similar problem with my M817 - I can adjust the linkage from the control box so that I can engage the PTO to the dump hydraulic pump, or I can adjust it so that I can disengage the PTO. However, there doesn't seem to be enough travel so that I can have it adjusted so that I can both engage and disengage the PTO. I've looked through the various TMs available on this site for information on adjusting the linkage, but I haven't found anything helpful there. I have two thoughts about cause of the problem.
The first is that I have noticed that the linkage arm coming out of the control box and going to the transmission power takeoff is made up of two linkage arms connected by a pivoting arm that basically shifts the linkage over to be inline with where it needs to be on the transmission power takeoff. There is some play in where the linkage arms connect to that pivoting arm - Should those connections be absolutely rigid?
The second idea I have is that perhaps the parts in the control box are worn such that the control box doesn't move the linkage arm over the full range that it is supposed to. Is that likely?
The linkage arm whose length I have tried adjusting is the long one that connects directly to the transmission power takeoff.
Check the free play in the plunger that controlls the hydraulics to the hoist. I found mine was sticking and badly out of adjustment I had to crawl under the truck and manually push it up to get the oil flowing and then pull it down toe get the body down
m816, the problem isn't with the hydraulics. It is with getting the pro shaft that powers the hydraulic pump to properly engage and disengage in the transmission. By adjusting the linkage length I can get it to either engage the pto with the transmission or to disengage the pto with the transmission, but I can't get it to be able to do both. It's like the range of travel for the linkage just isn't long enough.
When the pto is engaged the hydraulics work fine - I can dump and power down the dump bed and put it in the neutral position just fine.
Anybody out there have any more suggestions on what to look at?
817 dump truck question
