L48 Front Hydraulic Pump Coupling Shaft

Zippy Zoom

New member
Nov 7, 2019
3
0
1
Salem, NJ
Several years ago the composite plates that connect the coupling shaft to the engine and front hydraulic pump on my L48 failed as sis their replacements. Some kind soul on this board directed me to the factory solution that my local dealer hadn't heard of: a shaft with CV joints on either end to replace the entire assembly. Now THAT shaft has failed after many hours of service.

My local dealer says the part #32771-99702 - "KIT JOINT, F PUMP" is not available and is back ordered until next spring or later. If it was available this small shaft lists for about $725! I found 2 national parts houses that claim to have it in stock, but when pressed don't actually have it.

Meanwhile I've got a tractor sitting in an awkward spot with no way to lift the front bucket. Any suggestions?

Zippy
 

North Idaho Wolfman

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Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
21,003
95
48
Sandpoint, ID
Several years ago the composite plates that connect the coupling shaft to the engine and front hydraulic pump on my L48 failed as sis their replacements. Some kind soul on this board directed me to the factory solution that my local dealer hadn't heard of: a shaft with CV joints on either end to replace the entire assembly. Now THAT shaft has failed after many hours of service.

My local dealer says the part #32771-99702 - "KIT JOINT, F PUMP" is not available and is back ordered until next spring or later. If it was available this small shaft lists for about $725! I found 2 national parts houses that claim to have it in stock, but when pressed don't actually have it.

Meanwhile I've got a tractor sitting in an awkward spot with no way to lift the front bucket. Any suggestions?

Zippy
You can manually jack up the loader arms and block the cylinders to get it moved.

I would then hit up some local small machine shops and see what they think.
 

Roadworthy

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L2501 HST
Aug 17, 2019
765
78
28
Benton City, WA
You have a small shaft with cv joints on each end. Can these joints not be replaced with automotive cv joints or U joints? Just a thought.
 

rbargeron

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L5450, L48, L3250, L345 never enough attachments
Jul 6, 2015
693
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16
western ma
If you still have the old shaft and parts, you could get running again making some aluminum or steel drive disks with bolts & elastic stop nuts left a half-turn loose so the assembly can run without binding.

A local repair/machine shop could make up a new shaft with 2 inexpensive flex couplings. The pump and engine are both hard-mounted so all the shaft needs is decent torsional strength and a bit of alignment flex. Two-row chain couplings are inexpensive, easy to adapt, and long-lasting. Kubota used them on earlier models. Jaw-type couplings are cheap too and compact.
 

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Zippy Zoom

New member
Nov 7, 2019
3
0
1
Salem, NJ
I'm a pack rat from way back, but I'm pretty sure the old shaft went away in a cleanup-the-barn frenzy a few years back (why did I save this stupid thing????). I'll probably end up going to a machine shop with a pile of parts to see what they suggest. Sigh....

Zippy
 

rbargeron

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L5450, L48, L3250, L345 never enough attachments
Jul 6, 2015
693
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16
western ma
Looking at the parts diagram above, bring parts 50 and 70 with you and a good measurement of the installed distance between them. Also determine how big the coupling diameters can be and location of any tight spots. My L48's pump drive is working fine - let me know if you need any info from it. Take care, Dick B.
 

Zippy Zoom

New member
Nov 7, 2019
3
0
1
Salem, NJ
After a few go rounds with a few machine shops, I finally got a shaft that fit and installed it. It now happily spins the front hydraulic pump, but I still have no Hydraulics- not even to the backhoe which I did have before installing the shaft. Before I go crazy and replace the pump (I do have a spare), does anyone have a suggestion?

Looking at past threads I see the possibility that I may have lost prime to the hydraulic pump but no suggestions on how to fix this. Fluid levels are good, fluid is clean appearing and fluid and filters were changed about 100 hours ago. Super UDT was used. I'm willing to drain and replace filters and fluids, but I hate throwing parts and $ at it without an understanding of the problem.

Suggestions?
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
21,003
95
48
Sandpoint, ID
After a few go rounds with a few machine shops, I finally got a shaft that fit and installed it. It now happily spins the front hydraulic pump, but I still have no Hydraulics- not even to the backhoe which I did have before installing the shaft. Before I go crazy and replace the pump (I do have a spare), does anyone have a suggestion?

Looking at past threads I see the possibility that I may have lost prime to the hydraulic pump but no suggestions on how to fix this. Fluid levels are good, fluid is clean appearing and fluid and filters were changed about 100 hours ago. Super UDT was used. I'm willing to drain and replace filters and fluids, but I hate throwing parts and $ at it without an understanding of the problem.

Suggestions?
Cracking a pressure line fitting will sometimes assist in priming a dry pump.

Also check the suction side for any seeping leaks that could be sucking in air.
 

G.rid

Member

Equipment
L48 tlb, ssqa forks, manual thumb for hoe
Aug 19, 2016
175
1
18
Shelburne, NS, Canada
That's great that you got the shaft fixed but where's the pictures?

As far as no flow, my first thought was low oil.
 
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