diy crawler,hydraulic question.

[patp744]

So now I broke out the laptop..
I'm bouncing between granger and surplus.
It's going to be a good bet that the engine will be between 3200, 3600 rpm..
Granger stats have max rpm listed on there pumps but not hp. Need to drive the pump. Ugh..

How should one chose what gpm. The pump should be ? By reservoir size ?

 

[J_J]

Here are some hyd calculators you can use.

.Surplus Center

Go to left side and click on hydraulic calculators for pumps and or motors and input some figures.

 

[patp744]

ok ..so looking at surplus and using there calculators ..it looks like there wheel motors are out of range for this build.. the gpm and psi needed are to high .. i would need a 50+hp engine .
there is only one that would be do able i think
13.9 CU IN PARKER TE SERIES WHEEL MOTOR
New, Parker wheel mount hydraulic motor. Part number 18052.
SPECIFICATIONS

Model TE0230US250AAFB
Disp. 13.9 cu. in. / rev.
Motor Type Gerotor
Pressure:
1740 PSI cont.
2700 PSI int.
Torque:
3363 in-lbs. cont.
4554 in-lbs. int.
Speed:
150 RPM @ 9.7 GPM
328 RPM @ 15 GPM
Flow:
12 GPM cont.
15 GPM int.
Rotation Reversible
Mount 4 bolt Wheel Mount
5-1/8" B.C, 2-3/8" pilot.
Shaft 1" tapered with threaded end & keyway 2.59" OA length
Ports SAE 10
Size 4-3/4" x 5-3/4" x 4-3/4"
Shpg. 20 lbs.

and here is what that looks like

Desired Flow GPM 13
System Pressure PSI 1800

Horsepower Required HP 15.2
Calculated for electric motors. Double this figure for gas engines. ( so thats over 30hp . i would shoot for a min of 34 hp)
Desired Flow GPM 13
Operating Speed RPM 3600

Displacement (in3/rev) in3/rev 0.83

Pump Displacement in3/rev 0.83
Pump RPM RPM 3600

Pump Flow Rate GPM 12.94

Flow Rate GPM 13
Pump Displacement in3/rev 0.83

Pump Speed RPM 3618


am i going about this the right way ?

 

[patp744]

posting this here so i can find it later, even tho the calculator says i need 45 gas hp to drive it..

PRINCE GEAR PUMP

Prince, special non-symetrical gears give higher efficiency than conventional pumps. Alumninum body. Ideal replacement for many brands on tractors, other implements.
SPECIFICATIONS

1.654 cu in displ
13.90 GPM at 2000 RPM
2500 PSI
3500 RPM max
IN SAE 16 side
*****
OUT SAE 12 side
SAE A 2 bolt mount
CW rotation
5/8" 9 tooth x 1-1/4" splined shaft
5"x5-3/8"x4-5/8"
Shpg 10 lbs

 

[b7610hsd]

Check This out Dad Builds Mini Bulldozer from Lawnmower Parts | Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers

 

[patp744]

Check This out Dad Builds Mini Bulldozer from Lawnmower Parts | Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers

Yeah...I saw that ..it looks nice ..but I doubt he will put a woopen on it like I plan on with mine...that is if I ever find a main pump that can drive the motors that takes under 40hp.

I wonder why the calculator says to double the hp if it's gas anyway ? ?

 

[patp744]

There has to be something out there ,
Look at the toro dingo. They are under 30 hp and they have a pump that can drive, drive motors ..
And my terramite t5c is only 20 hp.

Maybe direct drive motors are WAY overkill for my needs .