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03-13-2024, 12:30 AM | #1 |
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Does anyone else have this on their truck?
On the dash is this T-handle and I'm trying to figure out it's purpose. It goes under the dash and connects to linkage or a bar that crosses over to the other side of the chassis, and then that connects to the Master cylinder. The truck has a parking brake on the floor. It doesn't connect to the pumps or pump gauges, as these are controlled outside of the cab. I don't think the truck has a PTO.
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03-13-2024, 02:14 AM | #2 |
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Re: Does anyone else have this on their truck?
Never seen one exactly like that, but my thoughts are that it's a hydraulic brake line lock. Step on the brakes then pull on the handle and it should keep the pressure in the brake lines. The second picture also shows the mechanical parking brake assembly - the wheel on the driveline and the mechanically operated brake bands.
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03-13-2024, 06:31 AM | #3 |
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Re: Does anyone else have this on their truck?
seen em before 4 wheel holding brake used for hillstarts etc with heavy load 4 wheels will hold where the band brake wont
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03-13-2024, 07:18 AM | #4 |
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Re: Does anyone else have this on their truck?
Yes that's a hill holder ,a neat thing to have on a big truck . Also ,Ken if your truck was a pump truck it does or did have a PTO to run the pump I would think. Is there a second drive shaft coming off the transmission? Tim
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03-13-2024, 03:46 PM | #5 | |
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Re: Does anyone else have this on their truck?
Quote:
Screenshot 2024-03-13 133627.jpg IMG_9190 (1).jpg Last edited by Ken T; 03-13-2024 at 04:00 PM. |
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03-13-2024, 05:48 PM | #6 |
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Re: Does anyone else have this on their truck?
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in business. https://www.waterousco.com/product-c...mounted-pumps/ |
03-13-2024, 06:46 PM | #7 |
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Re: Does anyone else have this on their truck?
The pump operator 'engineer' ran the pump from the pump station. generally had throttle control and an engine tachometer. My generator tach had a 10ft cable drive to the pump 'station'. Newc
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03-13-2024, 07:35 PM | #8 |
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Re: Does anyone else have this on their truck?
It has a throttle control just outside on the driver's side. It has linkage that connects it to the gas pedal. I think you explained what the thing on the front of the generator is. It has a cable that goes to the tach on the pumps.
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03-13-2024, 07:48 PM | #9 |
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Re: Does anyone else have this on their truck?
It fairly common (and "standard" now) to have a interlock to set the brakes before putting the pump in gear. That is likely part of a system of that sort.
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03-14-2024, 08:21 AM | #10 |
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Re: Does anyone else have this on their truck?
Wow! Shows what I know about fire trucks. It's kind of like a transfer case on a high boy ford and makes total sense. Tim
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03-14-2024, 10:43 PM | #11 | |
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Re: Does anyone else have this on their truck?
Quote:
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03-14-2024, 11:00 PM | #12 | |
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Re: Does anyone else have this on their truck?
Quote:
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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03-15-2024, 08:15 AM | #13 |
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Re: Does anyone else have this on their truck?
Ken , You have a good looking truck all the way around . I'm curious about that pump . Does it have a higher rear drive shaft gearing for the trucks road speed or is it just a pump with a manual coupling for the drive shaft? Does anyone here know? Big trucks are so low geared it would kind of make sense on a emergency vehicle. Tim
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03-15-2024, 05:36 PM | #14 | |
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Re: Does anyone else have this on their truck?
Quote:
I believe that the pump is like you said before, a transfer case on a 4X4. It at least appears that way. I'm by far, no expert. Screenshot 2024-03-13 133627.jpg unnamed (30).jpg |
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03-15-2024, 08:07 PM | #15 |
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Re: Does anyone else have this on their truck?
Typically a "midship" fire pump is designed to operate in the highest transmission gear. The transfer case engages the pump and disengages the the drive line from the rear axle (thus the need to positively set brakes). The pumper is NOT designed to drive with the pump engaged.
The small pump unit on the side of the transfer case might be a primer pump. If so this is a "positive displacement" gear pump which will pull a vacuum. These usually have some oil feed with a small reservoir up "high". Use of the primer allows water to be pulled up a suction hose to the main pump enough so it will begin moving water. (Yes, technically the water would be pushed by atmospheric pressure). The common operating procedure would be: Stop the pumper. Set brakes. Clutch in, transmission to neutral, shift to pump, transmission to high gear, clutch out. Throttle at idle. Step outside. Chock wheels. If you have a water tank (and many pumpers of that era did not) make sure all intake valves and discharge valves are shut and ports capped. Open tank to pump valve. Uncap and open one discharge port slightly. Increase RPM and operate primer until water is showing at discharge port. Now you can connect a hose or switch to another port and adjust RPM to achieve the desired discharge pressure. If you are not flowing water you can reduce RPM to idle and open a tank to pump valve to circulate water to keep the pump cool (running with the pump engaged and not flowing water can overheat the pump). If you are getting water from a hydrant or other pressurized source you may not need to use the primer. Open the appropriate intake valve and slightly open an outlet valve and wait for water to show. (DO NOT USE SUCTION HOSE ON A HYDRANT, bad things to a water system can happen). If you are going to suck water from a static source you will need hard suction hose, and all hose gaskets (and your pump, valves, and pipes) will have to be in good condition to avoid air leaks. You want a strainer and some means of keeping the strainer above the mud level of what you are pumping from (often the suction hose is tied to a ladder). (Sidebar... wading chest deep into a mill pond to tie off a suction hose is not a fun thing.) Those big lugs on the inlet side of the pump... thats so you can use a rubber mallet to try to get a good seal on the suction hose. With the discharge ports closed and the inlet open pull on the primer pump, this may take a few minutes. You should notice a vacuum indication on the inlet pressure gauge, then the suction hose filling with water and a change of sound of the primer pump as water fills the main pump. When you see pressure on the outlet gauge then slightly open a discharge port, if you have water showing then open it slowly until you have water freely flowing... now you can pump through whatever hoses you want to. |
03-16-2024, 04:05 AM | #16 |
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Re: Does anyone else have this on their truck?
Learnt a lot reading this thread and Karl's reply above.
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03-16-2024, 07:50 AM | #17 |
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Re: Does anyone else have this on their truck?
Thanks Karl, Good info on a subject I knew next to nothing about but was always curios about. Tim
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03-16-2024, 01:45 PM | #18 |
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Re: Does anyone else have this on their truck?
Thank you Karl, very informative. I spoke with a fire fighter last night and he explained a lot to me also. One thing I found interesting was that he clarified what the odd thing under the carburetor was. We assumed it was a Governor. He explained that it help cool the engine when the pump was running by pumping cool water from the pump to the engine. This being necessary because air wouldn't be circulating around the engine to cool it while parked. There's a 1/2" copper tube that runs from the device to the round handle under the gauges and this controls the water pressure .
unnamed (35).jpg unnamed (36).jpg Last edited by Ken T; 03-16-2024 at 02:18 PM. |
03-16-2024, 08:09 PM | #19 | |
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Re: Does anyone else have this on their truck?
Quote:
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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