hydrolic pump not building pressure

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inairam
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Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
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1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
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Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
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Location: Glen Mills PA

hydrolic pump not building pressure

Postby inairam » Sat May 27, 2023 7:56 pm

I noticed the hydrolic oil was leaking into the crank case. I had a pump that I rebuildt a few yeas ago and swapped it out. the pump does pump and causes some movement but not enough to lift a mower deck.

is there something in the rebuild of pump that can be missing that could cause it not to build pressure?
When you only have 9 horsepower you need to know the names of all of the ponies!

Bob McCarty
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Re: hydrolic pump not building pressure

Postby Bob McCarty » Sat May 27, 2023 8:18 pm

The older version has a small pin seal, black and shaped like a miniature pencil eraser. If it's not installed, the pump won't work. No way to tell without opening it up, unless you remember installing it. The figure 8 spring can also be installed upside down.
"We don't need to think more,
we need to think differently."
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Glen
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Re: hydrolic pump not building pressure

Postby Glen » Sat May 27, 2023 9:15 pm

Hi,
There is info about which pumps use the pin seal.
Below is a listing for the pump rebuild kit at TM Tractor Parts.
The 3rd pic has a pic of the pin seal, and the other parts in the kit.
The 4th pic tells the model numbers of the pumps, and which parts go in which models.
If you can enlarge the page, it says the pin seal is used in pumps with 01, 02, and 06 at the end of the model number. That is the maker's numbers. There is also the IH part number.
The numbers may be on the side of the pump toward the engine, or out where you can see them.

http://www.tmtractor.com/new/hy/288fp.htm

inairam
5+ Years
5+ Years
Posts: 2855
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: hydrolic pump not building pressure

Postby inairam » Sun May 28, 2023 6:37 am

It would not have been like me to miss the pin seal. I could have missed installing the Figure 8 seal correct side up.

How do you identify which side of the Figure 8 seal is up toward the drive gear?
When you only have 9 horsepower you need to know the names of all of the ponies!

Eugene
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Re: hydrolic pump not building pressure

Postby Eugene » Sun May 28, 2023 9:22 am

inairam wrote:How do you identify which side of the Figure 8 seal is up toward the drive gear?
Flat side to gears, pin/tang side to cover.
I have an excuse. CRS.

inairam
5+ Years
5+ Years
Posts: 2855
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: hydrolic pump not building pressure

Postby inairam » Sun May 28, 2023 6:12 pm

Eugene I flipped the. figure 8 seal and I got pressure.

thank you..
When you only have 9 horsepower you need to know the names of all of the ponies!


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