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Old 12-15-2011, 07:44 PM   #15
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Onan 7.5 HDKAJ Oil & Filter Change & Fuel Filter Change Instructions

Onan 7.5 HDKAJ Oil & Filter Change & Fuel Filter Change Instructions

1.)Remove bracket blocking the access door on bottom of Genset. There are two bolts & nuts at each end of the bracket remove all four. This bracket also supports the generator exhaust pipe.
2.)Remove one of the bolts holding the exhaust pipe and twist bracket to release pipe. I used a bungee cord to support the exhaust pipe.
3.)The access door to the oil filter and the fuel filter is now accessible. Squeeze the two plastic thumb
latches and pull down to release the access door. I personally remove the two star screws from the
access door also because it gives you more room to work.
4.) You can now remove the oil filter (Onan Part # 0122-0833) for mine you might want to check yours.
5.) The fuel filter can also be replaced through this access door.
6.) See photos on next page for further help.

Re-Install access door and support bracket and attach exhaust pipe.
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Old 12-15-2011, 08:11 PM   #16
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Onan Oil Change

Oh, by the way.
I use 5W50 yes 5W50 Castrol Full synthetic oil.
I have used the generator at 20 below zero and 110 above.
This oil is great and I never have to add any.
I change it every every 120 hours

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Old 12-15-2011, 09:24 PM   #17
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i use the same oil as goes in the engine, saves me carrying two different brands
and a fram filter ph3593A
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, no your eyes are fine, there are really 6 slides
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Old 12-17-2011, 06:04 PM   #18
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I am a fan of synthetic oil but for some reason the Onan manual specifically does not recommend it. I have the 8 kw on my 2007 but the manual is for many models.
Rick J Fisher, BW is Judy
2018 Tiffin Allegro 36LA
2003 Jeep Rubicon or a 1995 Toyota Tacoma
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Old 03-28-2012, 11:20 PM   #19
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This was been a very informational thread. Thank you.

Frank, Ana, Sophie and Analis
Looking Super Fly in THE COMVEE!
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