D5B SA Steering/Brake Question

Jake,

I'm not familiar with a 26 serial SA machine, but had a lot of hours on a D5-b dozer. The D5-b that I ran did not have the brakes on the friction levers like on a D6-D model let's say. The D5 was much like the D6-c models. Frictions out of dash and brakes on pedals from floor. They were not connected. The brake lock was a latch that held pedal down located by your right heel sitting in the seat down in front of seat just above floor. -glen

Hi, Jake.
If it is the same as the 44X D5B's, you tighten the brake adjustment right up then back it off 2 1/2 turns or 15 faces on the adjusting bolt. Also, while you're in there, make sure the retainer springs for the brake adjustment are present and working 'cos the little suckers will wind themselves back off if they ain't.

A 9/16 SAE ratchet ring wrench is a VERY handy tool to have when playing around in there. The voice of experience typing.

Not all D5B's had the inter-connected steering arrangement. I'm not sure what ser. # prefixes did have it but the 44X didn't have it and I LIKED it thataway. The 44X parking brake was a lift up-push down button beside the right arm rest but the parking brake applied automatically when the engine was shut down and engine oil pressure dropped away.

Just my 0.02.

Same arrangement as D5B 25X2073-up. Got parts manual but not service manual.

Thanks for the reply's. I do have the service manual for the 26X but it doesn't really help. It is more like an engineering manual than a service book. It describes how things work but with very little info on troubleshooting or adjustments. The parking brake has a hydraulic valve actuated by a small lever located to the right of the seat bottom. It has two positions, neither of which do anything when I tried. The hydraulic valve sends fluid to a small hydraulic cylinder that actuated brakes. I'm hoping someone has had experience with this situation on a similar tractor. The steering clutches and brakes seem to be adjusted properly. Thanks in advance for any help.

If the info is not listed in the "Systems Operation Testing & Adjusting" or "Specifications" section for the D5 Power train as part of the Service Manual it might be shown in the "Operators Manual"

Not much to the hydraulic parking brake control, just a two position control valve controlling the two booster spring chambers. Check and see if your getting flow and pressure to/from the valve.

The two boosters are a spring/piston affair. Could very well be stuck from lack of use.

The brakes on this beast might be best adjusted with the engine running with the park brake in the release position, there is a place to put a bolt in on both packs of the park side (spring pack side) of the system that will free off the park brake tension if the engine cannot be run and you need the park brake released, the brake adjuster should be done up to the firm position, then undone around the 9 clicks (9 flats) then the brake pedals checked for hight of travel, the spring pack safety brake is not without its drama's, I feel the latch to pedal control system was a lot safer in most cases, if your tractor is a manual drive 4th gear is also not without its troubles.
tctractors

p.s. Deas, engine oil pressure does not work the spring pack brakes, the spring packs have to be oil boosted to adjust the brakes correctly ( or wound off with the jack bolt ) just keeping my eye on you and your 2 cents worth

Thanks TcTractors . Are you saying that the park brakes are supposed to automatically engage when the engine is shut down? Mine don't. Do you think they don't work because the brakes are out of adjustment? Could that also be the reason the brakes don't engage with the steering clutches?
The brakes appear to be in adjustment but then this tractor is new to me.

Thanks TcTractors . Are you saying that the park brakes are supposed to automatically engage when the engine is shut down? Mine don't. Do you think they don't work because the brakes are out of adjustment? Could that also be the reason the brakes don't engage with the steering clutches?
The brakes appear to be in adjustment but then this tractor is new to me.

Jake, take a few moments to study the system, on the spring pack there is a plug also an information label near it,this is the point you can release the sping packs with the bolt that is already parked in a store position ready for this task, or the brakes as already said need power (Hydraulic) to release the spring packs, then the adjusters to the bands can be set, you did not spec your transmission style, but the mod's to 4th gear are plentyfull, the D5 VHP is a common mount in the U.K. as it is fairly powerfull with just enough weight, these are usualy set with Farm linkage and put to the Plough, 3rd and 4th gear are the usual cog to run in, the D6C/D in some ways is a better mount to run.
tctractors

p.s. Deas, why bother to bring up the engine oil pressure thing??? when the engine stops the steer/trans pump stops making a bit of oil movement, thats the bit that ebbs away allowing the mechanical spring pack to go all "springy", the brake bands on these beasts are those 720 deg jobs, and no your bit of script on how they work was bordering "Ley Person" Tech, keep up with the program.

always happy tctractors