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klparker

CAT330/3126 & Allison MD 3060

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Have a 2001 Itasca Horizon, @75,000 miles, and having trouble getting over hills (even small ones) without a toad. Have push button Allison transmission, diagnostic code is oL-70, Sump fluid temp too low. However, when code was checked the coach had been driven for several hours. No warning lights on transmission or engine and manual check of transmission fluid was OK. The coach shutters/vibrates and rpms and power drop when going up hills; runs fine on level roads. Can you help us get over the hills, please.

Parkers

2001 Itasca Horizon

Toad, 2006 Pontiac G-6

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Most likely suspect is clogged fuel filter(s). Absolutely the place to start with your symptoms. Climbing grades requires the most fuel. If fuel flow is restricted, this is where the "clogged filter(s)" issue will show up.

Do you have one or two fuel filters? If two, does the secondary fuel filter base have a manual primer pump?

BTW, that is not a diagnostic code on the Allison, just an oil level check.

To get to diagnostic codes:

Key on, engine off, push the up and down arrows on the Allison shift pad. This takes you to the oil level check (where you got the oL-70 code). PUSH THE UP AND DOWN ARROWS AGAIN. This brings you to the diagnostic codes. It will be d-1, followed by the code. If no code, it will be d-1 followed by - -. If there is a code, after recording it, push the mode button to go to d-2. Push D or just turn off the key to exit.

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No addtl. codes on transmission. Have two fuel filters, however, don't know if there is a manual primer pump. Will check and get back. Thanks for providing us somewhere to start checking.

Parkers

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The manual primer pump will be on the secondary fuel filter housing. If no pump, there will be a block-off plate held in place by two bolts. Remove the plate and you can install the manual primer pump if you do not have one. The manual primer pump makes filter replacement a lot easier and less messy!

This is what the manual primer pump looks like: https://parts.cat.com/en/catcorp/105-2508-105-2508-product

More information on fitting a secondary fuel filter and PN's for the manual pump: http://forum.dieselrvclub.org/index.php/topic,6611.0.html

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