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Old 08-13-2024, 12:51 AM   #26
dsraven
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Join Date: Nov 2010
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Re: 57 GMC 550 370 V8 exhaust gaskets

they say to use the pump in o/d because otherwise the pump turns too slow to operate properly. on some pumper trucks with an auto trans the trans has a lock out switch to keep the trans in high gear so when pumping hard the trans doesn't downshift. not good if something fails and that downshift happens, trust me. the guy on the end of the hose inside the burning building is trusting the pump operator with his/her life, so...
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Old 08-13-2024, 12:56 AM   #27
dsraven
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Re: 57 GMC 550 370 V8 exhaust gaskets

is that a water tender unit or a pumper unit? a water tender is a tanker truck with a smaller (usually) water pump on it than a regular fire engine would have. some tenders are made to "pump and roll" meaning they can use the pump while driving for extinguishing wildland fires, grass fires etc. some have water nozzles on the front bumpers for grass fires, others have a hose reel or hose line that can be held by a second person in the truck while they drive.
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Old 08-13-2024, 12:57 AM   #28
dsraven
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Re: 57 GMC 550 370 V8 exhaust gaskets

sorry, off topic there. I am a retired firefighter
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Old 08-13-2024, 01:55 PM   #29
prateroad
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Re: 57 GMC 550 370 V8 exhaust gaskets

Heads not off.
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Old 08-13-2024, 01:58 PM   #30
prateroad
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Re: 57 GMC 550 370 V8 exhaust gaskets

It's a pumper, has a huge pump above auxiliary tranny.
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Old 08-14-2024, 10:42 AM   #31
dsraven
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Re: 57 GMC 550 370 V8 exhaust gaskets

thats cool. some pics from all sides would be great just to see the whole truck.
any luck with those broken off bolts?
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