B7100 Hydraulic pump swaps

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
30,036
6,200
113
Sandpoint, ID
Well I ordered the wrong new filter, I hate it when you screw up ordering parts. I ordered the one for the Hydrostat version of this tractor. I also ordered all the "O" rings, I will get them tomorrow (since they are so close, ground delivery is same as overnight).

The pump was cleaned up after messing with it for a long time trying to get it to fit. I am hoping new "O" rings and filter will fix the issue.
It should do it.

If you have any worries out of your hose connection, simply put a second set of hose clamps on it, but I don't think that's your issue.
 

jrslick

Member
Jan 13, 2013
148
0
16
Clay Center, Kansas
Wolfman, I am back. I got the correct filter today, I bought all the right o rings and I cleaned everything off reinstalled the o rings in their groves, carefully put it all together and it still is sucking air. The lift is awesome. It has never had this much power before! I hooked my mower to the 3 point, thinking that maybe more weight would help, nope.

I did not change the pressure line copper crush washers. I did buy them, but I figured since I don't see any leaks there, I didn't want to mess with it.

I guess I could add another clamp to the rubber hose.

The arms still won't go down without turning the tractor off.

Any other ideas?
 

jrslick

Member
Jan 13, 2013
148
0
16
Clay Center, Kansas
FIXED IT. It was simple. There was some air or pressure or something stuck in the gear reduction unit. I relieved the pressure on the quick connect ball on the rubber hose, lots of air squirted out and some fluid and it goes up and down just fine now. I went out and mowed off some weeds to try it out. Thank you for all your help!


A side question, do you have any idea how this gear reduction unit works? I have never used it and I have never seen my tractor move with it. Just curious.
 

Attachments

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
30,036
6,200
113
Sandpoint, ID
I've never seen or worked on the reduction units, I can't even find any "paperwork" on them.

I would like to know more for future reference.

I think this is the reason your plumbing is so different than all the other models.
I think a lot of the parts were customised for that add on of the gear reduction unit.
 

Lil Foot

Well-known member
Lifetime Member

Equipment
1979 B7100DT Gear, Nissan Hanix N150-2 Excavator
May 19, 2011
7,500
2,519
113
Peoria, AZ
I've never seen or worked on the reduction units, I can't even find any "paperwork" on them.

I would like to know more for future reference.
I second that- if anyone has any experience with one of these, please post.
 

Jerry Martin

New member
Jul 15, 2013
10
0
1
Luck. WI
Well, it is installed and short story: it probably wasn't worth the time and money. That said, this would be an excellent and economic replacement for a worn-out pump, if they happen to be available when you need one.

Longer version: I've been checking the WHP website periodically and the other day things changed from 80 on order, 0 in stock to 63 on order, 1 in stock. So I snapped it up. They shipped it by DHL and it arrived from England in 3 or 4 days.

Before installing, I did some loader work moving snow piles to warm up the fluid. Then I checked the cycle time: 4 cycles of the lift arms from bottom to top and back down again took 63 seconds -- just a hair under 16 seconds per cycle. After installation the same 4 cycles took 51 seconds, or about 13 seconds per cycle. Better, yes, but less than 20% faster -- hardly the twice-as-fast I was hoping for by swapping in a 6 gpm pump for the stock 3 gpm unit.

Installation was reasonably straight-forward, except for the one nut at the top outboard corner. That one was a mother and required some customization of a 12mm wrench with a torch and grinder.

The plumbing outlets were fairly close to the stock location. The hard-piped outlet was 4mm further from the flange and the inlet is on rubber hoses anyway so the deviation was easily handled. For the outlet, I loosened the bolt securing the hydraulic block to the engine about 1/4", connected the banjo to the pump, then tightened the hydraulic block back up to draw the pipe into place.

Here's some pics comparing the original pump with its bigger replacement:








And one of the new pump installed:


 

Jerry Martin

New member
Jul 15, 2013
10
0
1
Luck. WI
Well, it is installed and short story: it probably wasn't worth the time and money. That said, this would be an excellent and economic replacement for a worn-out pump, if they happen to be available when you need one.

Longer version: I've been checking the WHP website periodically and the other day things changed from 80 on order, 0 in stock to 63 on order, 1 in stock. So I snapped it up. They shipped it by DHL and it arrived from England in 3 or 4 days.

Before installing, I did some loader work moving snow piles to warm up the fluid. Then I checked the cycle time: 4 cycles of the lift arms from bottom to top and back down again took 63 seconds -- just a hair under 16 seconds per cycle. After installation the same 4 cycles took 51 seconds, or about 13 seconds per cycle. Better, yes, but less than 20% faster -- hardly the twice-as-fast I was hoping for by swapping in a 6 gpm pump for the stock 3 gpm unit.

Installation was reasonably straight-forward, except for the one nut at the top outboard corner. That one was a mother and required some customization of a 12mm wrench with a torch and grinder.

The plumbing outlets were fairly close to the stock location. The hard-piped outlet was 4mm further from the flange and the inlet is on rubber hoses anyway so the deviation was easily handled. For the outlet, I loosened the bolt securing the hydraulic block to the engine about 1/4", connected the banjo to the pump, then tightened the hydraulic block back up to draw the pipe into place.

Here's some pics comparing the original pump with its bigger replacement:








And one of the new pump installed:


I have a question about the installation of this pump as I ordered one , came and I believe they sent me the wrong one or they assembled it backwards?
Well, it is installed and short story: it probably wasn't worth the time and money. That said, this would be an excellent and economic replacement for a worn-out pump, if they happen to be available when you need one.

Longer version: I've been checking the WHP website periodically and the other day things changed from 80 on order, 0 in stock to 63 on order, 1 in stock. So I snapped it up. They shipped it by DHL and it arrived from England in 3 or 4 days.

Before installing, I did some loader work moving snow piles to warm up the fluid. Then I checked the cycle time: 4 cycles of the lift arms from bottom to top and back down again took 63 seconds -- just a hair under 16 seconds per cycle. After installation the same 4 cycles took 51 seconds, or about 13 seconds per cycle. Better, yes, but less than 20% faster -- hardly the twice-as-fast I was hoping for by swapping in a 6 gpm pump for the stock 3 gpm unit.

Installation was reasonably straight-forward, except for the one nut at the top outboard corner. That one was a mother and required some customization of a 12mm wrench with a torch and grinder.

The plumbing outlets were fairly close to the stock location. The hard-piped outlet was 4mm further from the flange and the inlet is on rubber hoses anyway so the deviation was easily handled. For the outlet, I loosened the bolt securing the hydraulic block to the engine about 1/4", connected the banjo to the pump, then tightened the hydraulic block back up to draw the pipe into place.

Here's some pics comparing the original pump with its bigger replacement:








And one of the new pump installed:


Do you have a part number for the one in the picture. I ordered one and it is the exact opposite.

I ordered one and I think I received the wrong one, as the Inlet is on the bottom and not the top
Well, it is installed and short story: it probably wasn't worth the time and money. That said, this would be an excellent and economic replacement for a worn-out pump, if they happen to be available when you need one.

Longer version: I've been checking the WHP website periodically and the other day things changed from 80 on order, 0 in stock to 63 on order, 1 in stock. So I snapped it up. They shipped it by DHL and it arrived from England in 3 or 4 days.

Before installing, I did some loader work moving snow piles to warm up the fluid. Then I checked the cycle time: 4 cycles of the lift arms from bottom to top and back down again took 63 seconds -- just a hair under 16 seconds per cycle. After installation the same 4 cycles took 51 seconds, or about 13 seconds per cycle. Better, yes, but less than 20% faster -- hardly the twice-as-fast I was hoping for by swapping in a 6 gpm pump for the stock 3 gpm unit.

Installation was reasonably straight-forward, except for the one nut at the top outboard corner. That one was a mother and required some customization of a 12mm wrench with a torch and grinder.

The plumbing outlets were fairly close to the stock location. The hard-piped outlet was 4mm further from the flange and the inlet is on rubber hoses anyway so the deviation was easily handled. For the outlet, I loosened the bolt securing the hydraulic block to the engine about 1/4", connected the banjo to the pump, then tightened the hydraulic block back up to draw the pipe into place.

Here's some pics comparing the original pump with its bigger replacement:








And one of the new pump installed:


I received one of these and the inlet is on the bottom. I need to verify the part number you used when you ordered as mine is not correct. Appreciate the assist.

Thanks,
Jerry
 

Attachments

torch

Well-known member

Equipment
B7100HSD, B2789, B2550, B4672, 48" cultivator, homemade FEL and Cab
Jun 10, 2016
2,617
864
113
Muskoka, Ont.
The one that fit my B7100 was part number: 5P1/41041GPO description: GPO120R EQUIVALENT GEAR PUMP (The R stands for right hand rotation.)

The one that was opposite of what I needed, and is suitable for a gear-driven such as a later B8200 was part number: 5P1/41040GPO description: GPO120L EQUIVALENT GEAR PUMP (The L stands for left hand rotation.)

From your picture, I'd say you have the second (left hand) one.

What machine do you have?
 

Jerry Martin

New member
Jul 15, 2013
10
0
1
Luck. WI
The one that fit my B7100 was part number: 5P1/41041GPO description: GPO120R EQUIVALENT GEAR PUMP (The R stands for right hand rotation.)

The one that was opposite of what I needed, and is suitable for a gear-driven such as a later B8200 was part number: 5P1/41040GPO description: GPO120L EQUIVALENT GEAR PUMP (The L stands for left hand rotation.)

From your picture, I'd say you have the second (left hand) one.

What machine do you have?
B7100