I am with Jim K. on never running without a filter on the power steering system and the hydraulic wipers. Even with electric wipers installed you should still run a filter on the power steering system. The OEM filter assy can be taken apart and cleaned and reused. There are several canister type filter that can be used instead of the OEM filter. I also run a cooler in the return line back to the pump. I use filters harvested out of late model Cadilac’s.
The following filter are available for use:
AutoZone Part# 70702 Alternate Part# 20-P038F
Napa used to sell a filter under part# NSP20FTL3, but it does not appear to be in their catalog, but your local counterman may be able to find it.
O’Reilly under part# 991FTL2 and 991FTL3 search under power Steering filter and not part number
All these filters are in the $20 to $25 dollar range.
The go to filter used to be the AC PF-833 filter, but that is not readably available unless it sometime appears as NOS on Ebay.
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 30’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
>
> You never wat to run w/o a filter.
> THrowing it away is a temerary fix and will come back to bite you.
>
>
> On Fri, Aug 31, 2018 at 2:04 PM Charles Boyd
>
>> Sir, on the GMC the filter is bolted inline to the wiper motor and looks
>> like a 3" pipe nipple. It has stainless wire mesh in it and can be cleaned
>> by
>> removing and using solvent and shop air.
>>
>>
http://www.gmcmhphotos.com/photos/gmces-dillard-2c-ga-rally-2011/p38077-2-chiefs-and-1-indian.html
>>
>>
>>
>>
>>> Hi!
>>> I have been having a bit of trouble finding any information on my
>> hydraulic wiper system. I have a 1981 Holiday Rambler Imperial 33 and I
>> think it
>>> has the same or similar hydraulic wiper motor setup as your GMC
>> motorhomes..
>>>
>>> It has a slide switch on the dash that works a cable that goes to the
>> wiper motor. I unfroze the cable and linkage and got it moving..
>>> The thing is that the motor just doesn't seem to put out near enough
>> power/torque..
>>>
>>> If I take the wiper levers off the motor the motor turns and stuff but
>> it doesn't put out enough power to run the wipers.. Or if I give the wipers
>>> a bit of help manually they will go a bit but don't have enough power on
>> their own..
>>>
>>> I think I read something about an inline filter?
>>>
>>> The power steering pump also runs the power steering and power breaks,
>> hydraulic boost breaks.
>>> Both the power steering and breaks put out good power, to the point to
>> where they will make the power steering belt slip if you really step on the
>>> break or try to turn the front wheels sitting still..
>>>
>>> Yeah I know I need to tighten the belt. I haven't gotten around to that
>> yet, but the wipers don't make the belt slip or seem to draw much power
>>> from the pump at all..
>>>
>>> Any help diagnosing this would be excellent..
>>> If this machine is to ever tour again it is going to need functioning
>> wipers..
>>>
>>> I'm not looking to convert to electric yet, I would rather figure out
>> the hydraulic system and see if I can make it work first..
>>>
>>> Thanks guys!
>>
>> --
>> C. Boyd
>> 76 Crestmont
>> East Tennessee
>>
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>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk
>
http://www.appliedgmc.com
> 1-800-752-7502
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