Sehka77

Mack t ,ill look in to it not sure , thanks for help also Joey Mack it's running fine not over heating 

Thanks Joey Mack , I can spin fan when cold , so I'm sure it's working properly thanks for help everyone

Hayseed , I don't have pictures of it now  but Mr. Gumby  is correct looks just like it and seems to operate as he described.. thanks for you help all you guys 

Mrgumby ,yes thats it .. so that's correct because seems to be on at all times but spins different speeds .... I thought it was  defective because @ cold start fan Is on ..and truck runs good no issue does not over hear 

Squishy, thanks for your help , all mechanic engine , factory no a/c and fan clutch, so not air actuated .. so I'm guessing I cannot wire a switch to do it manually 

Mack's...... pictures of what ? Truck ? Or engine fan clutch?

Ron, thanks for the help .. and yes I sense fan clutch to be faulty seems to to run or be on at all times .... ..ill look into replacing it ..also truck original..has original engine From factory 

It's 1990 rd690 w/ e6-300 has fan clutch  not not way to wire a switch on it 

Hello, have a 90 rd model w e6-300 mechanical . I seems engine fan is on constantly on  is this normal ? Also would like to wire a manual switch to turn it on & off  no a/c from factory any help would greatly be appreciated thank-you 

Thanks Billy Mack appreciate that information  ill will check with them 👍

Thanks Joy Mack appreciate it ,

Rj1 thanks for yiu help this schematic will help alof appreciate it .. 

Yea understand,  thank you though for your time .. do you know of any other members that are in the west coast or any mechanic out here  

Ok understood,  this does help , thank for you feedback and help greatly appreciate it ..

Yes please get book number on maintenance and lube would greatly help. I have 1990 rd690s w/e6-300 .. last time I had backup light and  beeper wouldn't work , put power directly  both work so had to be a fuse mostly everything works on truck but when to look fuse panel and nothing label or no decals so no telling whats what..also have few issue with **red shutdown button on@ start up.. have good oil pressure,  not over heating,  tranny not overheading , every is fine runs good .. basically some sort of electrical issue .. truck has a kysor switch if your familiar I notice the coolant switch at radiator is un plug might the issue but want electric schematic on the e6-300  engine and possibly cab to see how's everything wired 

Thank you appreciate the help

Yes I did , I  will try to do some research  but I believe that  book will help ... Ill need one on the t2080 an 90 rd690s .. mainly because fuse box doesn't have a diagram or anything label and don't know what does what ? Any idea?

Joey Mack thanks for you reply..I did see the books you have . Might not be wat I'm looking for at this time .it's great collection and understand what you mean. .. I looking more for engine and transmission & truck manuals for my truck ..

Hello ,looking for repair or service manual for 1990 Mack rd690s  with e6- 300 with t2080  transmission  looking to buy any repair/ services manual for truck or engine ?? Any one have any please send me a message  thank you 

On 2/24/2021 at 6:40 AM, fjh said:

 Bro That was the test! a paper clip!

Thanks 👍

On 3/15/2015 at 6:42 PM, jakebrake86 said:

Turckster, you were right. The low water sensor in the reservoir fixed it. After you told me that, I unplugged it and jumped it with a wire, and the light went off. Do I replaced it and everything is working like it should now. Thank you very much. MACKS, try unplugging yours and jumping it. I bet it will solve your problems, too.

What do you mean by jumping it with wire ? Might have same issue trying see how I can test it 

Not running in that picture,  just ignition on , but once truck is on light stays on , oil pressure normal , temp normal, battery voltage normal , have to double on coolant might be low I think that's the issue..

Thank you Guys for your help 

Hi, I have 90 Mack rd690s with e6-300  , I have this button dash .. ***Red shutdown *** would always turn on @ start up then shut down but now STAY  ON CONSTANT WONT TURN OFF **unless I shut off ignition or truck of.

Can someone tell what that is or does? How to fix it thanks 

Hi , have 1990 mack rd690s with e6-300 mechanic .factory no A/c  ..looking for aftermarket unit but need to see which compressor it needs and which bracket and a/c belt is used to be able to install aftermarket unit .. any help with pictures of mechanic e6 with factory a/c will.help or part numbers ? There's 2 different a/c compressor? And different brackets ? Also need new  belt  to accommodate for  a/c appreciate any HELP