2 weeks ago my HD6EP started showing the same symptoms as Edwin and Dozer described on theirs. Hot or cold the thing would erratically loose tranny and clutch pressure,(kind of like a pump was loosing prime), when the pressure dropped it wouldn't pick up a gear and if it did pick up a gear it wouldn't push (tranny clutches slipping). When the pressure was good all was good.
I dropped the oil out when hot and replaced the 3 paper filters (two for steering and one for tranny mounted on a bracket at the front of the tranny) I checked the scavenge pump steel suction screen at the bottom right of the tranny and also the small screen on the small torque converter bleed back line (Pre S/n 18765? 1965) and both were clean. I filled it back up with oil but the problem was still there??????
In the schematic in the service manual it showed a suction screen for the tranny/convertor/steering pumps but nothing was shown in the owners or parts manual???? Later I found a picture of it in the steering clutch section of the parts manual.
I spoke to Ac_sd and MervHD6 and they told me that the suction screen that I hadn't checked is inside a casting at the left front of the tranny under the paper filter. It's bolted on with 4 bolts and has two suction hoses coming out of it. When you pull the casting out you will see the large pleated steel screen screws into the back of it --- man was it clogged up. It fits into a cavity on the left side of the tranny but draws oil from the crown wheel housing. I spent 20 minutes cleaning the crap out of the screen with petrol and compressed air then put it all back together. It now goes like AC intended!!
Thanks Bob and Merv
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