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d 8n transmission hot

B

burns

Well-Known Member
Joined
Aug 3, 2015
Messages
46
Location
australia
i have a d8n that transmission temp light is coming on. ive changed oil and filter and checked screen flushed radiator. my belt pulleys were worn so I changed them, im getting good cooling threw the radiator and threw the transmission cooler, ive put a temp gun on the transmission and it was getting hot. I put the transmission into neutral and rev the engine and it will not cool, what throws me is that when I stick it into gear the temp will go down. ive checked pump pressure and its in spec, my next step will beto do a stall test on the t/c has anyone had a similar issue?
 
M

Mark250

Senior Member
Joined
Aug 30, 2015
Messages
1,243
Location
victoria,Australia
Occupation
heavy equipment technician
hi, there are too many versions of the D8N transmission to help without serial number
Mark
 
A

ATCme

Well-Known Member
Joined
Aug 24, 2015
Messages
113
Location
bc
Funny my Komatsu D65 does the exact same thing. Only stays cool when it's under load at high rpm. Running in neutral does nothing to cool it. I suspect either my t\c regulator valve or my relief valve is sticking or broken. I've eliminated everything else beside a t/c rebuild at this point.
 
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