Troubleshooting: Dump Truck Pump and PTO Troubleshooting

In this video we talk about the common problems that can occur with a dump truck pump and PTO system as well as proper operating procedures.
We have several more troubleshooting videos on the way, comment below on which ones you would like to see.
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[@christosvolikakis1523]

3:28 as a former dump truck broker who had drivers, this would be a must! This would have saved me thousands and thousands of dollars in labor and hydraulic pump costs as beginning drivers forget to turn off their PTO leaving the job site. It’s also very dangerous for overhead obstacles. Great idea that should come standard with all new pumps. Also, an overall great explanation of how your hydraulic system works. This video should come standard with taking your DMV test for driving air brake vehicles that have hydraulics.

[@davidearls277]

The main reason 1 out of 20 fail right away is they are mostly low quality China product. The only dump pump still made in the USA are Permco. Even Parker/Commercial are not made in youngstown anymore.

[@TruxasSales]

Premco is hard to get a pump out of

[@davidearls277]

@@TruxasSales That is true. Our lead times are the highest they have ever been .Trying to get castings out of USA foundries now that many of the biggies are coming back is tough. We were kicked out of the foundry we poured our dump pump valve housing and finding a new supplier wasn't easy. That being said our lead times are better than most of our competitors. We are working very hard on this.

[@philipcbarrera1537]

Thanks for this detailed explanation. It really helped out how PTO works.

[@TruxasSales]

Glad it was helpful!

[@MrMcCloud100]

I'm trying to find pto for my Peter.Built 579 can't seem to locate one at all here in Florida.Need help

[@appalachianamerican3881]

Thanks for the video. I'm driving a Western Star 4900 offroad and trying to familiarize myself with some of this so if I find myself in an situation I can potentially fix it myself instead of waiting an hour or two for my mechanic to come to me. One issue that is common with offroad hauling is mud clogging the plunger and not letting the bed raise. I drove a Mack RD for a while when I was 22, but I quit driving trucks for a few years and now that I'm starting back I'm trying to remember this all.

[@TruxasSales]

Glad it was helpful!

[@luashelton9320]

Thank you for this video. Seems nobody else has explained PTOs ' and pumps in the detailed way you have done here. I'll sure be checking your channel for any new troubleshooting videos . I searched hard for info on PTO's and was relieved to find this video !

[@TruxasSales]

thanks, we have a lot more trouble shooting videos on the way.

[@ronniesalley6955]

I have a 1995 C60 Kodiak that has a Tulsa chain powered winch coming off the pto. I'm mounting an IMT HYDRAULIC crane on the bed that is hydraulic. What are my options for running both devices? Not necessarily at the same time it's just one is hydraulic, and one is chain driven.

[@TruxasSales]

most transmissions have 2 pto ports so you can have 2 hydralic systems, or you can by a more complex pump depending on what your powering

[@blythkd9017]

Good video, thanks. Might also go into reversing the pump and plumbing options if you do another video.

[@michaelnimba6421]

Thinks for the video I just learn something about the PTO

[@marioatrucking]

Nice. On my truck. I have the air valve one. But I only see 1 air line. On yours I see 2 airlines. I changed my flip switch that turns the light on. On mine, the pump stays on running... It doesn't matter what position the up or down lever is. If I pull the lever, it will go up. I ran out of ideas.

[@TruxasSales]

Shutting the pump off manually is normal. you can set up an automatic pto shut off when you start lowering the dump body.

[@christopherlewis1017]

Very informative, appreciate you shay

[@TruxasSales]

Glad it was helpful!

[@luism2959]

I have an older dump truck and my clutch got stuck downwards wont come back up could it be bad clutch or pump and pto ?

[@TruxasSales]

bad cluch or cluch linkage , not related to pto

[@kevinsmith7525]

My dump truck bed lowering way too fast when it's coming down how to adjust it

[@TruxasSales]

Depends on if its air controled or cable? If it has a load in it it will always be prone to coming down fast.

[@jaclynannbarnett]

Thank you for the explanation!

[@michaelcostello6991]

I really think a schematic of the circuit would have clarified how this circuit works for people not familiar with this already. Can you add this. Just a simple sketch of pump/valves etc etc

[@TruxasSales]

We may do a part 2 video that will go more in-depth, this one already came out to 20min

[@renzosilva2860]

Thanks for your video. It's hard to find a video the way you explain it. I live in Denver. Colorado. I bought a 1993 Peterbilt 379 dump truck a few months ago and fixing and replacing parts here and there. I need your advise about my pto and hydraulic pump. My pto is air controlled. No issues when I rise the bed, but when I try to lower it I need to move the pto knob almost til the other end for the bed to start lowering down, but my concern is that it slam and shake the whole cab. I know it's not right. Could you please tell me what' you think could be wrong? Thanks in advance.Renzo

[@TruxasSales]

when you say "pto knob to the other end" I think you may be referring to the air control that raises and lower the bed, which is actually the pump control. the air control are typically that way where is all the up or alll the way down, to go down slow you need to open and close the pump valve. A different valve may work easier, if the valve is really old it may be time to clean or replace it, a few drops of the Bendix oil in the line can help too.

[@renzosilva2860]

@@TruxasSales Yes I was talking about the pump control next to the PTO (IN/OUT) control. Are you saying replacing this dual control valve that I have will help with this issue? I wish I could send you a video that it will explain better what is happening with my truck. When the bed is all the way up and I move my pump controller to lower the bed the two top cylinder sections collapse really fast shaking the cab and then from the third section down start coming down slowly. Thank you so much for your time and for your help in advance.

[@moisesalvarado4203]

Gracias por la esplicacion👍🌞

[@gaylewells]

My pto won't disengage

[@tonyball436]

How to bleed your system after installation of new pump.?

[@TruxasSales]

depends on the hydralic hoist you have some are self bleeding. but the air will get trapped i the hoist not the pump

[@scottsterling8416]

I just bought a 2001 international 4900 dt466e dump truck retired city street dept. plow truck has a allisson auto and they claim the pto is always engaged or no switches or levers to engage or disengage that doesn't sound good to me is there a way to change it or just add a switch or cable?

[@TruxasSales]

you can set them up with the cable, but most are electric becuse the transmmision needs to know your turning the pto on.

[@scottsterling8416]

@TruxasSales I want to make it a part time pto so you have to engage it can you lead me in that direction please

[@scottsterling8416]

I'm being told that it's made in the automatic transmission and runs all the time that just don't seem right to me @@TruxasSales

[@treyharris7389]

Where does the hydraulic line coming from trailer connects too oil tank or pump

[@TruxasSales]

pump

[@bizzaregamer2546]

On Friday, i went to go dump a bed full of dirt. I drive a Peterbuilt. On the way up, not even a quarter up the way, i noticed my tarp was still down. Stopped the bed from going up to raise the tarp. Once i did that, the light on the control module for the bed that’s in between the 2 seats, the light went off. Now i can’t raise the tarp not the bed. What happened ? Any ideas? Feel free to call me plz

[@CarlosGonzalez-bs6hl]

Can you clock a pto or pump to not hit air tank. It seems mine is hitting to the point where i would need to remove air tank and remount or get new smaller tank

[@jeremiahsmith5048]

I have automatic 2018 Dodge RAM 5500. When I press the PTO button, the truck idles up and PTO doesn’t turn on. No matter what RPMs get changed to in the PTO settings in the truck it still won’t turn on. PTO measures 12 volts and all fuses are good. Any ideas what might be causing PTO not to come on?

[@daddie8383]

Pto lever not going to raise what could be the problem

[@TruxasSales]

Pto lever dosnt raise the bed the pump control dose. Is yours air or cable?

[@danielvandaele7642]

Thank you so much!!

[@TheTony13tyamaha]

was a very good video. Im a new mechanic to this type of work. Maybe you can do more trouble shooting on the actual PTO for the next video. The trucks we have here are PTOs that dont use air. Im guessing they are using trans pressure to engage. ( they are all auto allison transmissions)

[@TruxasSales]

we do have a couple Allison auto videos, that will be posted soon and explain the best pto set up for an Allison.

[@TheTony13tyamaha]

@@TruxasSales thanks

[@positivevibesonly8334]

What is a normal sound when u turn Pto on

[@TruxasSales]

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv, not kukuukukukuukukukukukuukukuukukukuku

[@imanvirk2750]

Hey, I have a 2020 kenworth t800 with an Alison transmission,Muncie pto. My pto is stuck the engaged position. I was wondering if you had any advice on the situation. I have already replace the solenoid.

[@anthonypadilla1436]

I have and automatic transmission Eaton fuller will that Muncie fit and how much should I shim it?

[@TruxasSales]

you always have to measure each transmission to see what thickness of shims are needed. they all vary a little.

[@rayr1444]

Buy a Chelsea 489 PTO instead. One supplied gasket is only needed for proper backlash.

[@briangarrett8388]

My bed not going up or down. I hear air coming out the exhaust side of the hose. I can just move the level valve from hold to up or down and it leaks air out.

[@ThePepetono01]

I have a six wheeler dump truck with an air operated PTO. the body goes down pretty fast at all times. Any advice of what might be the cause? possibly a restrict or or check valve that might be installed? If so, do you guys stock those kind of parts as well? Thanks!

[@khorommbikennedymatenzhe5131]

how do you control the bucket lifting cylinders not to experience high pressure when offloading to eliminate hydraulic system pipe bursting?

[@lr818]

I just had this problem... when I lower box and then tried to raise box the small little piston gets stuck and won't let box raise i have to hit it with a hammer to get it loose then it will raise up

[@randymorman4989]

I had a inline filter on the system and couldn't get it to stop leaking, the bed would go up real fast, but when we aliminated the filter the bed wouldn't go up near as fast

[@See.history.24]

nice

[@dionreid5411]

What if the bed raises and lowers without issue while sitting still but when trying to tailgate gravel the bed won’t raise as you drive forward?

[@bat2ball.comofficials862]

good

[@ACHorton]

Excellent informative vid!

[@TruxasSales]

Glad it was helpful!

[@randymorman4989]

Our mechanic can't figure it out, he thinks it's the PTO ?

[@ferminromero1040]

Pto cover elect switch cover leaking changed gasket still leaking?

[@sethsadler4321]

What would make my bed start dumping when I just turn the pto on and won’t stop going up until I push the clutch in it won’t stop if I turn the pto off or put in in lower position just if I push the clutch in then I can lower the bed also air powered

[@TruxasSales]

out of adjustment hoist controller.

[@betoyepez2689]

Great video man quick question do you know how to raise the psi on the pump ?

[@danielvandaele7642]

I have a driver who insists on leaving his bed up every night and the Maxle lowered almost to the ground. Is that ok to do? If not why? Thank you. All your videos are great.

[@TruxasSales]

You dont want to leave the bed way up because it exposses the dump cylynder to the elements and it can become tarnished or rust (the chrome part of the dump cylinder). Dump truck hydralic hoists are not the same as heavy equipment hoist that are ment to get wet. Raising it 6" to 12" to aviod puddling in the bed is good.

[@behilubdada]

Hi, please let me know how to fix the pto pump leak

[@TruxasSales]

take it apart and put new seals

[@behilubdada]

@@TruxasSales thank you!!!

[@RapidlawnCa]

We have a 2019 F750 with a Chelsea PTO and it's crazy loud when engaged. The noise goes away when the truck is revved up. I'm told this is "normal" but to me it sounds horrible. Any suggestions?

[@TruxasSales]

what transmission does it have?

[@robertocarlosgonzalez5360]

I have a issue, when I'm lowering the end-dump, start losing hydraulic fluid for the tank lid. What could cause this?

[@TruxasSales]

It needs a small baffle protecting the vent cap. when you lower the bed the oil is shooting into the tank at high speeds.

[@limbirdvisario7273]

Pls tell me the components of electrical system that activates the pto sytem of howo dumptruck..the pto of the truck is not engaging.pls help me..

[@TruxasSales]

each truck is wired different but ultimately its a wire from the battery/ fuse box going to a switch

[@ziedgargouri8260]

Very nice video Question pls, can the PTO stuck the transmission while starting engine ?? I have problem with my transmission, I couldn’t run my engine. I have doubt that PTO is the responsible part of this blockages Pls advise thank you

[@TruxasSales]

I don't think so, I haven't herd of that. Especially if you have a transmission mounted pto and the transmission is in neutral.

[@greggray2195]

Just wondering why my air operation doesn’t stop the bed in neutral position, I always have to go just a touch past neutral to stop the bed from going up:::: anything would help,,, is there any adjustment for air adjustment

[@TruxasSales]

maybe your control valve/ dump valve has air leaking to the air cylinder and is opening it

[@lindaflynn6324]

I have an 8200 International with 10 ft dump bed. I tried to tighten the safety cable you refer to in the video and it pulled out the cylinder when I raised the bed and didn't shut off the PTO. Why did it pull out the cylinder without shutting off the PTO?

[@TruxasSales]

It only shuts off the pump, not the pto.

[@straightshooter3643]

I have a 1975 Chevy C-50 dump truck. The PTO has a shifter from floor, not a pull knob. I'd love to see any video on best wat to engage and use properly.

[@TruxasSales]

yes we have an operation an maintenance video planned

[@katiekingrey9171]

Is there a filter on the hydraulic system itself? My dump bed has recently started to slow at times, and I’ve noticed hydraulic fluid leaking. One mechanic mentioned a possible clogged filter. But not sure where the filter is located

[@TruxasSales]

No filter is necessary on these system because the flow is so slow, but you should change the oil every other year.

[@christabor3864]

What would cause a single stage cylinder

[@jerrykinnin7941]

I got a IHC roadranger trans. Single line for a Pratt dump chassis. Dump will go up but not down. Is the pressure release valve hard to replace?

[@TruxasSales]

Their in no pressure relief valve on most dump truck pump set ups. I would start with check the adjustment of the tipping valve.

[@Hopeful1__7]

I have a air operated pto and works fine except when I lower it with a load there’s no way to do it slow it just drops at full speed. Any suggestions would be greatly appreciated.

[@tonyball436]

Seal in side pump is what I heard in the earlier video

[@Imhoffc33]

How does it work with a truck with dual or triple functions for the hydraulics like a hook lift truck? Is it just a pump with no valve built in and it runs into multiple valves like a tractor?

[@TruxasSales]

correct. the pump is pumping all the time and pressurizing the valves, and their is a return line.

[@michaelcostello6991]

When you shut pump off with the wire rope what actually happens. Does pump keep rotating and oil diverted back to tank ?

[@TruxasSales]

yes the pump keeps rotating and can overheat, you can put a pump return line, that will increase your run time with no flow.

[@nobleroofinggeneralcontrac7961]

I have an old central axial pump on an old dot truck. I have not run it yet are those reliable because they rotate off the front engine.

[@TruxasSales]

that pump may not work for a dump truck application. but if its old and still works, its probably reliable.

[@robertgranberg6018]

Very informative video

[@michaelcostello6991]

Why is there not a pressure relief valve to protect pump ? Does pump reverse direction for up down or is it the DCV attached to pump etc

[@TruxasSales]

yes it back flows thru the same line, no pressure relief necessary.

[@kingriik1447]

If you using a grain gate and you have to leave the bed in the air until you finish?

[@TruxasSales]

no, you can close it

[@joeoviedo9506]

Why do I hear a grinding sound when I lower my dump trailer?

[@TruxasSales]

Could be damaged hydraulic cylinder or cylinder seals.

[@phillip4328]

I got Question, I have a direct mount pump to the PTO as shown on this video, Now is there a universal Yoke joint that can work off the Pump Shaft Using a pto shaft ❓

[@TruxasSales]

all Yokes are universal, but need to be the same size to work.

[@rayr1444]

You either have direct mount components, or remote mount. They are not the same.

[@bobbyvelasquez8818]

can add or do demo on truck the actual operation all the steps and do's/don't that you have discussed on this video. thanks

[@TruxasSales]

yes we have an operation an maintenance video planned

[@Luillo49]

What will be the issue of when cylinder start bouncing at the last stage and hydraulic tank has enough hydraulic fluid. Also if i continue to accelerate to raise it all the way when I turn off the pump and lower the cylinder hydraulic fluid start leaking bubbling out of the hydraulic tank.

[@TruxasSales]

You need to bleed the air out of the cylinder, if you don't have a self-bleeding one, should be an air bleed valve on the top of the cylinder. check the oil level with the cylinder up.

[@rayr1444]

You have air in the hyd oil. Your reservoir may be too small.

[@Cordovarubio]

Question, if the dump truck bed is coming down too fast while unloading, what could the issue be?

[@TruxasSales]

could be there is material stuck in the bed making it weigh more

[@rayr1444]

You either need a feathering air valve for controlling the valve, or...you are disengaging the PTO when lowering the bed. Don't. Use the hydraulic control valve only to lower the bed. When it's down, then disengage the PTO.

[@grandlizard1566]

What type of hydraulic fluid do I use for my PTO? I have a 1998 Chevy C6500 rollback tow truck with a 6 spd manual tranny. I assume the large tank just between the frame rails is for that hydraulic fluid, yes?

[@TruxasSales]

Any fluid should work, because its a low flow system, but mixing different fluids can be a problems and cause foaming.

[@rayr1444]

The PTO is just a gearbox mounted to the tranny, lubed by the transmission. The hyd pump uses hydraulic fluid. Use AW32.

[@cink1461]

my pto exhaust port leaks intermittently.... like 80% of the time. Anyone have an idea what may be the problem?

[@sherwindavis482]

Did you find the problem

[@rayr1444]

Replace the air switch. That is where the exhaust is.

[@theiceman4227]

Can you make a video on the pto blowing fuses?

[@TruxasSales]

The fuse would be in a different place depending on who installed it. Fuse blown would be bad job wiring typically. We are make a video on a complete dump truck pto and pump installation.

[@jameshughes6454]

Why can't I get the air value to work just put a new one on

[@TruxasSales]

Not sure what air value is? You mean valve? check the air pressure, may not be high enough.

[@rojobackape1669]

I have an issue with my air controlled pump when the bed is fully raised. It stays up and doesn’t go down I have to engage the pto again and dump it for the bed to go down

[@TruxasSales]

is it an auto transmission? may be a compute issue

[@rayr1444]

You aren't supposed to disengage the PTO until after the bed is down. When you do that, the system is causing everything to reverse, including your transmission. Use the air switch for the valve to lower the bed with the PTO still engaged.

[@mikevoinche9423]

pto wont engage when air swich is turned on it wants to engage but makes grinding noise help

[@TruxasSales]

if you have a clutch petal push it in before engaging. If its still grinding could be not installed properly.

[@mikevoinche9423]

pto wont engage till air psi is to 120 and then when lowering trailer it takes the same psi and lowers real slow

[@luzdeechannel9730]

How about the pto relay where to find it?

[@TruxasSales]

its likely a fuse in the fuse box

[@grizzwald1979]

Stuck with a load of black top lol.

[@TruxasSales]

bummer

[@omarleal3746]

How do you make the pump go just a lil faster on a system with air lines not cable

[@TruxasSales]

Pump should go faster when you throttle up the truck with the gas pedal. you can also check that you have spec'ed the right size hydraulic lines.

[@rayr1444]

Buy a faster ratio PTO, or, give it the gas.

[@scotthill1909]

Is there a high pressure relief valve in the systen?!

[@TruxasSales]

Not typically on dump truck systems.

[@rayr1444]

Yes, the dump pump valve has an adjustable main relief built in, preset at 2000 psi. Max setting is approx 2300 psi.

[@NootNoot67]

Thanks for the video. I learned a lot. My Muncie Air actuated PTO on my bucket truck is stuck on or engaged all the time. Now because of this video I know what I am looking at under the truck as far as how the PTO is actuated and what actually does that.

[@TruxasSales]

Glad it helped

[@NootNoot67]

@@TruxasSales I removed the unit, cleaned and lubed it. It was "sticky". It appears that the air actuated plunger was sticking. Now it is working great. Thanks again.

[@vicenteaguirre534]

when pto wont turn off

[@rayr1444]

Shimmed too tight, air pressure too low, shift fork broken, etc.

[@shaverdave3644]

What causes the tipping valve to lock and not go up or down fully ? Took the cable off and cannot push the lever to down position

[@TruxasSales]

Not sure, but could be broken internally, or some of the seals have become unseated and are jamming it.

[@murphy4trees]

awesome video. My air controlled PTO is sticking on. I have to go under the truck and hit the air control unit (with the airline going to it) with a hammer to get PTO to disengage. Any suggestions

[@TruxasSales]

You can try putting a few drops or air valve oil, which all the air valves on the truck need once a year or so. Or replay the valve and remember to oil.

[@jnalexisjn2810]

Hi, I have a international 1987 it’s a dump truck 7 speed I cannot find a PTO How can you help me please

[@TruxasSales]

call or visit a muncie dealer with your transmission number and model

[@weluvbikes07]

What would cause the bed to go up while in the hold position. On a 3 line system with sleeve installed.

[@TruxasSales]

The dump cable is not properly adjusted or the seals in the dump valve are going out.

[@rayr1444]

Look for dirt or stones stuck near the rear of the spool that do not allow full shifting of the spool.