74 JD 830 Hyd pump retrofit

[RottenGround]

Has anyone every changed the stock tandem open center pump to maybe one from Surplus Center they list several tandem style pumps as long as the pressure and flow is the same I myself dont see why we couldnt make it work Thanks again.

 

[J_J]

If the shaft size and type shaft, spline, key-way, etc, and the bolt holes align up, it might work.

 

[buickanddeere]

Just how much $$$ are you counting on saving ?

 

[RottenGround]

Thanks, does anyone by chance know the pressure and gpm of the stock pump i know one section is for the power steering the other for hydraulics. Can You buy rebuild kits for the factory pump and i have seen a reman pump for about 650.00. Not sure how much one from Surplus center is they start out at 100.00 or so I would like to find a reasonable factory pump. Does anyone have a factory AL24233 proofmeter for the 830 thanks again

 

[buickanddeere]

I suppose an aftermarket pump if carefully chosen would suffice. Going higher on the GPM and to a stronger better sealed higher pressure pump won't damage anything. It's the same relief valve setting.
Deere parts list. TxJim has figured out how to post images form the parts list, I haven't yet.

HYDRAULIC PUMP
(POWER STEERING PUMP)
11 CM3 (.67 IN.3)
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. REMARKS
1 L29364 DRIVER 1
2 L29371 O-RING 1
3 L29366 SCREW 4
4 L29359 COVER 1 (SUB AL37750, AL36651, AL36652, AL36653, (2) 19H3241 AND (2) 12H293)
5 L24688 RING 2
6 L25367 SPACER 2 (SUB AL37750, AL36651, AL36652, AL36653, (2) 19H3241 AND (2) 12H293)
7 L25366 RING 4 (SUB AL25629)
8 L29362 PLUG 4 (NLA)
9 L29363 PLUG 4 (NLA)
10 L29360 PLUG 4 (NLA)
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. REMARKS
11 L29361 PACKING 4 (SUB AL25629)
12 AL24191 KIT 1 (PART 2) (SUB AL37750, AL36651, AL36652, AL36653, (2) 19H3241 AND (2) 12H293)
13 L29368 LOCK WASHER 2
14 L29367 SCREW 2
15 L25368 PLUG 4 (SUB AL25629)
16 26M4222 SHAFT KEY 1 3 X 16 MM
17 L25365 RING 1
18 L29365 COVER 1 (SUB AL37750, AL36651, AL36652, AL36653, (2) 19H3241 AND (2) 12H293)
19 12H301 LOCK WASHER 1 1/2"
20 14M7155 NUT 1 M12
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. REMARKS
21 AL24190 KIT 1 (PART 1) (SUB AL37750, AL36651, AL36652, AL36653, 19H3241 AND (2) 12H293)
.. AR55346 HYDRAULIC PUMP 1 (WITH POWER STEERING PUMP) (SUB AL37750, AL36651, AL36652, AL36653, (2) 19H3241 AND (2) 12H293)
.. AL25629 KIT 1 PACKING (PART 1)
.. AL25630 KIT 1 PACKING (PART 2)

 

[Tx Jim]

b&d
Posting parts photo is easy. right click on photo then click "save image as" then click on "go advanced" then click on "manage attachments" then click on "add files" then click on "select files" then choose photo out of downloads on "your computer" then click on "upload files" then "submit reply. It's usually true that a picture is worth a 1000 words.

 

[Tx Jim]

RottenGround
I think a big problem to installing a pump from Surplus Center would be getting an adapter to attach the hyd lines to the pump. Without the aid of a service manual I'd guess the pump output to be 10 GPM.

 

[RottenGround]

Would be better to go back with factory pump. My tractor loses hydraulics when u push the clutch all the way down which stops the transmission oil pump my manual says there is a supply bypass valve which is a check valve or sorts that is suppose to open due to negative pressure from the tranny oil pump stopping i can see the supply bypass valve when i drain my fluid and take my shifter housing off so i took and brazing rod and bent a hook and thought it was stuck and it was but i still lose hyd pressure at full clutch so i figure my main pump is wore out due age and what not but i can start the tractor without the shifter installed and let out on the clutch and u pump and little stream out of the front of the tranny oil pump is this normal? if it is not it could be sucking air there instead of pulling the from the supply bypass valve

 

[Tx Jim]

Have you changed hyd filter and checked/cleaned trans oil sump screen lately?????

 

[RottenGround]

I serviced it out completly i bought the tractor like it is the screen was pretty bad yhe filter wasnt to bad

 

[Tx Jim]

I'll suggest you check hyd filter relief valve to see if it's stuck/plugged with debris.

 

[RottenGround]

Is that right above the hyd filter seem like when i serviced it out i took that out and apart and cleaned it

 

[RottenGround]

if u go to jd parts go to tranny oil pump/lines and it is the far picture to the left that is the supply bypass valve it is suppose to open due to negative pressure I.E. when the tranny oil pump stops pumping. It is suppose to open from suction from the main hyd pump. when i run my tractor with the shifters tower off and the tranny oil pump starts pumping it has a little stream coming out of the front around the shaft that runs through it. I am wondering if it sucks air there so the main pump cant pull suction to open the supply by pass valve.

 

[RottenGround]

The Earlier tractors didnt have that supply bypass valve so I am assuming that it would be normal to lose hyd pressure when u stop the pump

 

[Tx Jim]

Hyd filter relief valve are parts key # 24 & 27. Is your 830 a built for N. American or European sales model? Please elaborate on the supply by-pass line you referred to. Are tubes in 2nd photo what you are referring to??

 

[RottenGround]

Yes when i serviced out the tractor i took the 24 and 27 out and inspected them yes #4 is the tube on the earlier SN models and the far tube to the right is the one with the supply bypass valve that is the kicker off to the bottom. If i understand right the earlier tractors with # 4 would lose hyd pressure when u clutch it. My tractor was made in germany but i can see it has the supply bypass down in mine when i take the shifter tower off and drain fluid

 

[Tx Jim]

830 built for N. American sales doesn't have option for both supply lines just the one in photo. To my knowledge both 830 models(built for N. America & built for Europe) were built in Germany

 

[RottenGround]

Yes the one in the photo is the line with the supply bypass valve? Does the Tranny oil pump have any seals or just open on the shaft that goes through it

 

[Tx Jim]

Trans pump has no seals.

 

[RottenGround]

OK could possibly have wear on the gears to suck air around them or the o rings in the picture could be bad?