ford 420 backhoe

   / ford 420 backhoe #1  

markmc60

New member
Joined
Jul 27, 2011
Messages
16
Location
Palmer Texas
Tractor
JD4430,Ford 600, cub, JD400 backhoe, JD450 dozer, Cat 913 motor scraper, Allis Chalmers D grader
I have a ford 420 backhoe, it is so weak it will not pick up a round hay bale, pitiful.
I want to replace the Hydraulic pump but the previous owner swapped it with a smaller unit I think and i do not have the make/model/GPM of the original pump. How can I find that information to get a replacement pump?
 
   / ford 420 backhoe #2  
What do you mean by weak? Have your did a pressure check. Do you know if the cyls are good.

Does the BH have it's own pump?

I would install a hyd pressure gage in the hyd system before the first valve and use it to monitor and trouble shoot the hyd system.
 
   / ford 420 backhoe
  • Thread Starter
#3  
what I mean by weak is it is weak, will not lift a roll of hay, wont lift the back end up on the stabs....weak
all the cyln bad?...no,.... the cyln do not leak, it does not have the power the pump should be putting out, the previous owner paid a beer lover to replace the hyd pump, he did, pretty sure he got an old worn out pump for it and I am not sure what the original pump is suppossed to be.

and yes, it is the pump mounted under the front cowling, runs off the crank.

all I am looking for is the original part number and GPM, since I do not have a parts manual.
 
   / ford 420 backhoe #4  
The point I am trying to make here is that it doesn't matter the size of the pump, the pump pressure are about the same 2500 to 3000 psi. If the pump is not meeting those specs, then it could be considered weak. Force produced by a cyl, is based on the pressure, bore and rod size. So, if the cyl are good, and the pump pressure is good, then the loader or 3pt is doing all it can. In order to boost things beyond specs is is necessary to increase the pressure or get larger cyl.

GPM's determines the speed of cyl movement, or hyd motor speed.
 

Tractor & Equipment Auctions

2007 INTERNATIONAL 7400 DT466 SFA 4X4X CHASSIS TRK (A51406)
2007 INTERNATIONAL...
2017 Rogator RG1300B Dry Fertilizer Applicator (A52128)
2017 Rogator...
2014 Ford Taurus Sedan (A50324)
2014 Ford Taurus...
2020 CATERPILLAR 326 EXCAVATOR (A51242)
2020 CATERPILLAR...
2012 WARREN POWER SYSTEMS 100KW GENERATOR (A50854)
2012 WARREN POWER...
New JCT 7' Double Skidloader Grapple Bucket (A50774)
New JCT 7' Double...
 
Top