just wondering if anybody knows how the emergency steer works on a john deere 300d? is there any way to test it?
You have to install a kit for secondary steering. Call brandt and ask them about it.
The emergency steering pump is mounted on the transfer case so it is driven as long as the machine is moving. It performs 2 functions. 1. It backs up the main steering when the main steering is slow such as going down hill or slowing down for a turn with the engine idled down by adding flow to the steering system. 2. In case of engine, main pump, or transmission failure, it senses the loss of pressure in the steering system across a balance valve and will provide oil flow to the steering system while blocking out the main circuit. It is a smaller pump so steering won't be as quick as normal, it is only designed to give enough flow to bring the truck to a stop. Obviously, as the truck slows down the pump being ground driven will slow down the flow, and when it stops there will be no flow. There is a pretty complex way to test and set the pressure, but there is a low main steer pressure warning light on the dash and a buzzer.
Thanks we are taking our trucks in to a mine pit and the safety guy wants to see if the trucks have emergency steer. we tried a few tests shutting the engine off but it just kicks on the brakes. Is there a way to test it while driving? Thanks for the reply
You might want to check with the Deere dealer to see if there is a way to do that. Other then that, because the emergency pump also is backup flow source for the main pump, the only way that I can think of is: The emergency pump pressure is set slightly below the main pump pressure, so if you lowered the main pump pressure way down, the emergency pump would think that there was problem with the main pump and would supply steering as long as the truck was moving. Obviously you would want to be in a safe level area to do this. The system that I was refering to was on a "C" model and didn't have the automatic brake apply with engine shut down, so you could test the system by shutting the engine down.
Thanks for the reply. we have to find a way to manaul test the trucks while moving and no power the komatsu's have a swithch on the dash that turns on emergency steer. still waiting to hear back from brandt no one seems to know of a way to test the truck.
The early Bell trucks before Deere was involved had emergency steering set up differently. Basically they had a Starter motor driving a small pump to the steering system. If the engine quit or the main pump went down, a pressure sensor would trip a relay and the startor motor would run that small pump until the batteries went dead, but that should be enough time to stop the truck. That may be what Komatsu is using. The only way to test the truck while running that I can see is if there was a "Test" switch" installed to block power to the relay that activates the brake lockup when the engine is shut off. This also may be a safety factor so you would need to clear it with Deere before doing it or have them do it. seems like this would be a normal test procedure at other job sites, so I still think that you need to get the Dealer to push Deere to put a "Test Swhitch" on all the trucks that have emergency steering.
hey guys, If anyone needs this I got something I could fax you on this. From Deere. Let me know!!
The old Unit Rig Electra Haul M100 and the M90 had the same system that oldseabee noted but the Unit Rigs had a switch on the dash to turn the system on It worked well pulled lots of dead trucks out of the pit using emergency steering system. The truck had 2 8D 12 V batteries never had problem
just got back from out of town at work. thanks for the reply I could use any info you have but my fax machine is broken going to have to go pick up a new one. are you able to email the info or I can post you when i get the new one hooked up.
Yea just hit me up when get it. Only way i have now.