Branson Injector Pump

[dpauly]

2011 Branson 3120R. Approx 1700 hrs. Having issues with reaching "PTO RPM's". Fuel filter is clean; lift pump (aftermarket) putting out 6+ p.s.i. Started having issues trying to get tractor to full power. Tractor actually "ran away" twice despite it being a non-turbo (wasn't familiar with this phenomenon when it happened. All I could think of to do was nudge it into a nearby tree to stall it when neither throttle nor key had any effect . . .) Only thing I haven't yet done is a cylinder compression check. Have disassembled, cleaned and then checked injectors (unseating at approx 2300 psi if I'm remembering correctly.) Inj. Pump is a Doosan (Doowan?) which I have come to learn is a Korean knock-off of a Zexel (Japanese) which is a licensed copy of a Bosch VE type pump. Have learned from speaking with shops specializing in rebuilding these pumps that tech data/specs for these Doosan/Doowan's are about impossible to find; thus, it's a shot in the dark for them to find parts, Test Bench specs, etc. Anyone had similar experiences, and what did you do to solve this problem (I'm aware I can buy a new one thru Branson but don't really want to fork out close to $2 grand until exhausting all other options.) Another thing that really frustrates me is there apparently is no set procedure for setting up the tractor's engine to remove the existing pump so that a replacement can be put back and all inside the engine will be in proper position. Youtube is full of vids for other brands of tractors/engines showing proper procedures for removing existing pumps. Not Branson - very hard to find much of anything for the DIY'er. This alone will probably keep me from buying another Branson. Thanks in advance for any help you might provide.

 

[K5lwq]

One, if you would have posted this in the Branson forum you probably would get more responses. In that forum there is a link to the Service manuals for Branson tractors. There you can find the one for your tractor and download it. It will tell you the proper procedure to remove the pump. Here is a link to the thread that has manuals.

Updated list of Service Manual + Part Books

***NEW UPDATE*** WELL IT TOOK THEM LONG ENOUGH BUT HERE IT IS EVERYONE THE 4 RANGE 2021+ 20 SERIES SERVICE MANUAL - 20S RANGE4 2021-2022.pdf **UPDATE** 5835R PARTS BOOK - 5835R.pdf *UPDATE* i now have the new 2020+ 15 series service manual this will apply to both the K models and us 15 series...

www.tractorbynet.com

I am fairly confident that pump can be rebuilt by a qualified professional. I highly recommend a member on this forum. His handle is @thepumpguysc. Maybe send him a private message and see if he is willing to look at it for you.

 

[dpauly]

Thanks, K51wq. Will contact him.

 

[ericm979]

If the PumpGuy can't help there are a lot of Kukje/Cummins A series pumps out there on alibaba etc. The hard part would be finding one that matches yours but since you have the pump nameplate that might be easier.

 

[thepumpguysc]

Unfortunately I’m swamped at the moment..& I don’t have the time to jump into a project that intensive..
I normally jump at a chance for a project like that but not at this time.. sorry..

 

[sallyb]

Unfortunately I’m swamped at the moment..& I don’t have the time to jump into a project that intensive..
I normally jump at a chance for a project like that but not at this time.. sorry..

thepumpguysc could you please tell me is there a puller or special tool that’s needed to pump off, we are shipping pump with injectors to a pump repair shop here in Texas,but got it 1/3 out and can’t get it off gear to engine, does it need special puller, brother was prying and stopped said he didn’t want more damage, Thank You

 

[thepumpguysc]

U did a good thing.. DO NOT PRY ON IT..
How about sending me a pic of the pump so we can talk apples to apples..
Send it to my home email..from your mail service.. to: my screen name at aoldotcom

 

[sallyb]

Will do, I am visiting son and family will go home tomorrow, and send pictures, will try video, Thank you so much. Sally

 

[sallyb]

U did a good thing.. DO NOT PRY ON IT..
How about sending me a pic of the pump so we can talk apples to apples..
Send it to my home email..from your mail service.. to: my screen name at aoldotcom

Sent pictures to your email. thanks for your time and help. sally

 

[Fixastuff]

I’ve had a few looked at by a local pump place. Every time there was a small part they couldn’t get.

 

[Landrun]

2011 Branson 3120R. Approx 1700 hrs. Having issues with reaching "PTO RPM's". Fuel filter is clean; lift pump (aftermarket) putting out 6+ p.s.i. Started having issues trying to get tractor to full power. Tractor actually "ran away" twice despite it being a non-turbo (wasn't familiar with this phenomenon when it happened. All I could think of to do was nudge it into a nearby tree to stall it when neither throttle nor key had any effect . . .) Only thing I haven't yet done is a cylinder compression check. Have disassembled, cleaned and then checked injectors (unseating at approx 2300 psi if I'm remembering correctly.) Inj. Pump is a Doosan (Doowan?) which I have come to learn is a Korean knock-off of a Zexel (Japanese) which is a licensed copy of a Bosch VE type pump. Have learned from speaking with shops specializing in rebuilding these pumps that tech data/specs for these Doosan/Doowan's are about impossible to find; thus, it's a shot in the dark for them to find parts, Test Bench specs, etc. Anyone had similar experiences, and what did you do to solve this problem (I'm aware I can buy a new one thru Branson but don't really want to fork out close to $2 grand until exhausting all other options.) Another thing that really frustrates me is there apparently is no set procedure for setting up the tractor's engine to remove the existing pump so that a replacement can be put back and all inside the engine will be in proper position. Youtube is full of vids for other brands of tractors/engines showing proper procedures for removing existing pumps. Not Branson - very hard to find much of anything for the DIY'er. This alone will probably keep me from buying another Branson. Thanks in advance for any help you might provide.

2011 Branson 3120R. Approx 1700 hrs. Having issues with reaching "PTO RPM's". Fuel filter is clean; lift pump (aftermarket) putting out 6+ p.s.i. Started having issues trying to get tractor to full power. Tractor actually "ran away" twice despite it being a non-turbo (wasn't familiar with this phenomenon when it happened. All I could think of to do was nudge it into a nearby tree to stall it when neither throttle nor key had any effect . . .) Only thing I haven't yet done is a cylinder compression check. Have disassembled, cleaned and then checked injectors (unseating at approx 2300 psi if I'm remembering correctly.) Inj. Pump is a Doosan (Doowan?) which I have come to learn is a Korean knock-off of a Zexel (Japanese) which is a licensed copy of a Bosch VE type pump. Have learned from speaking with shops specializing in rebuilding these pumps that tech data/specs for these Doosan/Doowan's are about impossible to find; thus, it's a shot in the dark for them to find parts, Test Bench specs, etc. Anyone had similar experiences, and what did you do to solve this problem (I'm aware I can buy a new one thru Branson but don't really want to fork out close to $2 grand until exhausting all other options.) Another thing that really frustrates me is there apparently is no set procedure for setting up the tractor's engine to remove the existing pump so that a replacement can be put back and all inside the engine will be in proper position. Youtube is full of vids for other brands of tractors/engines showing proper procedures for removing existing pumps. Not Branson - very hard to find much of anything for the DIY'er. This alone will probably keep me from buying another Branson. Thanks in advance for any help you might provide.

I’m in the same situation, how did you reinstall injection pump, TDC

 

[Landrun]

how did you install the injection pump in your Brandon tractor

 

[thepumpguysc]

I’m wondering if the drive shaft and drive gear are keyed.??

 

[dpauly]

how did you install the injection pump in your Brandon tractor

Prior to removing old Inj. Pump I set #1 cylinder to TDC (making sure piston was coming up on 'Compression' stroke.) Removed fan, belt, entire gear cover (aka gear case. Careful, my downloaded from 'Net digital shop manual diagram only pictured a couple fasteners but there are 15 on the front of the cover alone; with an additional bolt coming in from the back in the corner by the Hydraulic Pumps.) Removed nut that held Inj Pump gear on the pump's shaft. Compared key way on new Inj. Pump to ensure it was in same 'clock' position as old pump (it was.) Removed old pump (12", 1/4" extension and 12mm socket allowed coming in from behind the Inj. Pump between it and the engine block to get at the pump's mounting bolt that is 1 of 3 and located on the back of the Gear Case between pump and eng block) and installed new one. 'Lost' RPM's/power are back!

I’m wondering if the drive shaft and drive gear are keyed.??

I’m wondering if the drive shaft and drive gear are keyed.??

Yes, pump shaft/gear are keyed so as long as you get engine timing right before removing old pump & gear and new pump comes with shaft clocked correctly the new pump should line up.

 

[dpauly]

how did you install the injection pump in your Brandon tractor

Landrun, see my reply from 10-7-25. Careful about that bolt coming in from the rear of the gear case near the Hyd Pumps (on a 2011 A1500 engine, anyway. Can't speak to the higher C.C. engines.) You will have to remove the Hyd Pumps to get the Gear Case Cover off (and again on this engine) probably the starter because everything is so crammed together, in order to get the Hyd Pumps off.