new to truckmount need advice

Howdie

New Member
Oct 17, 2020
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Howard
hello! i recently purchased a used truckmount.

ENGINE: kohler command pro 25
BLOWER: sutorbilt 4m blower
PUMP: cat 290

shaft coupler is dodge para-flex px70(very shaky, need to modify to get rid of the shake).

before, nothing works.

i did an overhaul on the engine, and on the blower. now it runs without shaking and is running like a top.

i just have few questions, do i need to run the engine to 3600 rpm to get the max cfm of the blower? currently theres no silencer or heat exchanger attached to it, so even at 2600rpm the blower is very loud, the engine has a make shift silencer that works for testing purposes.

other question is for the coupler, is there any way to use different adapter instead of the tire looking rubber in the middle? i tried removing the coupler, but it seems stucked so i guess i am gonna stick with this for the time being.

its got a pump that i have yet to try. but i already rebuilt with new seal.

any help will be greatly appreciated!
 

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Kevin Dumas

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Aug 31, 2008
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That looks like the guts out of a old Hydramaster Hydracat that was retrofitted with a new engine.
Nothing wrong with the PX-70 Dodge coupler. I ran them on several machines.
There are 5 bolts on each side of the coupler flanges you loosen to remove the coupler element.
Each bolt goes through the outer flange and into the inner flange which squeezes together to hold the rubber element. Let me know if you have any other questions. I ran hydracats for 30 years.
The blower silencer that was used on them was a 2.5" Stoddard silencer.
 

Howdie

New Member
Oct 17, 2020
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Real Name
Howard
That looks like the guts out of a old Hydramaster Hydracat that was retrofitted with a new engine.
Nothing wrong with the PX-70 Dodge coupler. I ran them on several machines.
There are 5 bolts on each side of the coupler flanges you loosen to remove the coupler element.
Each bolt goes through the outer flange and into the inner flange which squeezes together to hold the rubber element. Let me know if you have any other questions. I ran hydracats for 30 years.
The blower silencer that was used on them was a 2.5" Stoddard silencer.
thank you for responding!

is there anyway to use a different element instead of the tire/donut in the middle. i cannot get it to install without any bumps. it always shakes at high speed.
 

Kevin Dumas

Well-Known Member
Aug 31, 2008
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Binghamton, NY
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Kevin Dumas
thank you for responding!

is there anyway to use a different element instead of the tire/donut in the middle. i cannot get it to install without any bumps. it always shakes at high speed.
If it shakes either your element is bad for some reason or not installed correctly between the flanges or more likely the machine and blower are not lined up correctly. Given that the engine was swapped out and new motor mounts installed my money is on improper alignment. The PX-70 is a tried and true coupler.
 

Howdie

New Member
Oct 17, 2020
12
2
3
Real Name
Howard
If it shakes either your element is bad for some reason or not installed correctly between the flanges or more likely the machine and blower are not lined up correctly. Given that the engine was swapped out and new motor mounts installed my money is on improper alignment. The PX-70 is a tried and true coupler.
upon checking the px70 element, its got bubble bumps on few spots around the outer tire, do you think thats the issue? i just check the spacing and alignment of both blower and engine. and they seem to be spot on. i will get a new element since its in stock locally on where i live.

thanks again for your help!
 

Kevin Dumas

Well-Known Member
Aug 31, 2008
3,418
941
113
Binghamton, NY
Real Name
Kevin Dumas
upon checking the px70 element, its got bubble bumps on few spots around the outer tire, do you think thats the issue? i just check the spacing and alignment of both blower and engine. and they seem to be spot on. i will get a new element since its in stock locally on where i live.

thanks again for your help!
A pic would be helpful