Adding cab heater to 763F

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brt

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Joined
Feb 23, 2009
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42
I'm adding a cab heater to my 1999 763F and will be plumbing it through the waterpump bypass hose. Can anyone tell me which end of the hose is the pressure side and which end is the return side? If you could let me know what the forward (when you are looking at the engine from the back of the machine) connection is and what the connection with the bolt-on plate is that would be a great help. Sorry for no photo. Just could not get it to work.
I've noticed on factory installations that there is some type of "H-Shaped" plumbing arrangement in that area. I plan to install some valves to isolate the heater core during Summer operations to keep some heat out of the cab. Is that "H" arrangement necessary? Any suggestions from you guys that have added a heater would be appreciated.
I've installed a "G" Series door on my "F" Series 763 and it came out great. It latches correctly, the door hold open strut works well and it is weatherproof. I'll show you how its done later. For now I just need the heater so that It stops frosting up inside.
 

OldMachinist

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May 24, 2006
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The "H" configuration on the stock heater is so that there still will be some flow thru the bypass hose when the heater control valve is turned off. There's a small orifice in one of their fitting that makes most of the coolant flows to the heater.
 
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brt

Active member
Joined
Feb 23, 2009
Messages
42
The "H" configuration on the stock heater is so that there still will be some flow thru the bypass hose when the heater control valve is turned off. There's a small orifice in one of their fitting that makes most of the coolant flows to the heater.
Do you happen to know the rough diameter of the orifice? I'm sure that I could design something to restrict the flow if I have some idea of the hole size. Thanks for the info
 

Bobcatdan

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May 3, 2012
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Do you happen to know the rough diameter of the orifice? I'm sure that I could design something to restrict the flow if I have some idea of the hole size. Thanks for the info
I could be wrong but I think flow would come from the base of thermostat. Unless the heater core has a designated in or out, I don't think it really matters.
 
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