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Re: Belt driven hydraulic pump for bed dump
MontanaLee #1335977 Sun Dec 01 2019 04:26 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
any body have a clue, as to the Mfg, size, etc?


1948 3/4 ton Chevy Pickup
Re: Belt driven hydraulic pump for bed dump
MontanaLee #1335995 Sun Dec 01 2019 06:08 PM
Joined: Jun 2011
Posts: 3,627
E
Shop Shark
One could mount a Saginaw power steering pump with dedicated drive belt, remove belt when not in use, might pump slowly, though.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Belt driven hydraulic pump for bed dump
MontanaLee #1336043 Mon Dec 02 2019 03:00 AM
Joined: Apr 2016
Posts: 552
M
Shop Shark
I have a n SM420 in my shop with a PTO on it. Did they use those to run a pump or are they too slow?


Old enough to know better, too young to resist.
Re: Belt driven hydraulic pump for bed dump
MontanaLee #1336151 Mon Dec 02 2019 11:35 PM
Joined: Aug 2018
Posts: 393
2
Shop Shark
hi mick53,
5 of the 6 trucks i have came with PTO driven hydraulics for the bed lift, 3/4 ton to 2.5 ton, all similar looking pumps that are inside their reservoirs (black box with PTO input and a up/down lever)
they were not factory, but the trucks were designed with installing a bed lift kit in mind
many trucks would get the lift installed by the dealer so you could start using it as soon as it was home

the pump isn't fast, but it's quite tight, if you don't stop it you can hear the engine RPM drop very sharply as the rams bottom out.
if you forget the PTO on and go for a fast drive i was told you could pop the PTO housing off the transmission and be left with broken gears and castings.

the PTO is a lot more power than any belt can output,
at idle speeds it looks to be turning a about 100 rpm or so, you can always pull out the throttle to make it spin faster, but that's never necessary with the pumps on my trucks
full over load of gravel goes up at any RPM, just goes up slower
-s

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