Mackman686

Hi everyone, I thought i better give you and update on the low air buzzer going off all the time. Sooooo after pulling the dash apart and tracing wiring over the long weekend of easter for 4 days, I found the problem!! I replaced the multi buzzer as i thought my old one was buggered, it was the buzzer its self was so i soldered a new one into the board. The new multi buzzer that i got, original Mack part must have some different circuits to the old one and was back feeding power out of the board and setting the kysor and low air alarms off. So Ive attached a couple of photos of the boards the green one is the new one and the original is the cream colored one. And i got a period correct wiring diagram for the truck which has helped with a few other problem which have been sorted. Cheers Keegan

Hey there, yes it does have a kysor shutdown system in it. The shutdown light comes on then goes out when oil pressure is reached. It has these 2 senders on the water jacket, I assume the rear one is the kysor and the other is water temp. I test the wire coming from the plug for the multi alarm and when I’ve reached air pressure it still has power and when the pressure switches are unplugged just the same

Yeah it’s sounds like a power back feed but will check everything that has been suggested. Thanks again!!

Nah I haven’t unplugged the turn signal, it’s brand new aswell and never had this issue until I’ve started putting everything back together in the truck. I’ll try that though cheers

Yeah it is a multi buzzer, low oil pressure, low water, low air, power divider, and the turn signals.

Hi all, I’ve got a problem on my hands. My low air buzzer is going off all the time in my 1990 Mack RB688RST nz model. I’ve replaced and now unplugged the new air pressure switches on the fire wall and the buzzer is still going off. The only way to stop it is by pulling the circuit breaker out or turn the key off. Any help would be much appreciated, photo below of the truck and the buzzer set up. Thanks again

Hi All, Thanks guys, very much appreciated on the nice comments!! Just have to juggle work and Spare time to work on the RB. id thought id chuck up a couple of photos of when it was brand new working for Thames Freight-lines in the North Island of New Zealand hauling wood chip for most of its life. Cheers Keegan

Hi All, Have a few updates on the rebuild of the Mack RB, November it went in a got the chassis sandblasted and got a coat of paint on it. December holidays i got the rims and spacers all painted and started assembling everything. Its coming together and looking awesome!! Here are some photos to show you all the progress. Cheers Keegangan

Hi Vladislav, Yeah not much we can do about the people in the world who stuff it up for the rest of us!! yes the twin steer axles and tandem drive axles (8x4) is very very common here and has been for a lot of years in every part of road transport with being able to get a decent payload with axle weights. that MH was on logs and towed a 3 axle and or a 4 axle trailer pull trailer which is still a combination that is still an everyday use and in the last 10 or so years they've added a 5th axle to the trailers for more payload. cheers Keegan

Hi H67st, Yeah they've come up really good and Ive gone for the old school look and gone back to bulb tail lights.

Hi Vladislav, Yes it was the last E9 V8 Ultraliner built in New Zealand, the last Ultraliner in the world was also built here aswell in 1999 and road registered January of 2000. It now sits in the Bill Richardson Transport museum in Invercargill.

Mack rb air start.mov

Hi All, Sorry about not updating you all sooner, so it's been nearly 18months from the last photos I posted and the RB is back together and I'm waiting on the sand blasters to have a spot ready to get the chassis blasted then I can paint it. So in the mean time Ive been tiding up wiring and air lines and now it to the cab and doing the same in there. I fabricated the guards and rear light bars myself and made up a set of Aussie road-train style rubber rear mud guards something different over here but i like them from when I drove road trains myself in Western Australia. any other photos that that I take ill make sure i post them!! And there is a video for the died hard Air starter fans like myself. Cheers Keegan

Hi Bob, This one here is an E6 350, it was originally a 12spd Mack box but changed out for an 18spd Mack box somewhere along the way. They come out with an E7 300 or 400 in them in the later ones but not V8. As for the E9s being in NZ yeah they are here getting fue and far between now but they are still about. This was the last V8 built in NZ, in 1999 and was a 610hp.

Thanks mate, yeah there is a lot of differences. I think these were the first macks in NZ to have the air cleaner under the bonnet, everything else was external.