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Bobcat 773G thermostat housing gasket

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andyjax

Well-Known Member
Joined
Jul 15, 2014
Messages
45
Location
Georgia
Hello all-

My 773G is overheating slightly ( creeping into the yellow band ) only when I work it the hardest with a heavy duty brush hog. Coolant level is OK so I thought I'd replace the thermostat. Do I need sealant and a gasket for the housing or just a gasket? Thanks!
 
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andyjax

Well-Known Member
Joined
Jul 15, 2014
Messages
45
Location
Georgia
Thanks folks. Yes the radiator is clean. I'm a little worried that it may be a bigger problem but I'm going to try the thermostat first. Is it possible to have a head problem if no coolant is getting into the oil ? Sometimes I do see what looks like steam on coming from the back and bottom of the engine but I can't find a leak anywhere. Any help greatly appreciated.
 
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Welder Dave

Senior Member
Joined
Oct 11, 2014
Messages
12,548
Location
Canada
If it has a block heater in the head check that it isn't corroded and leaking at the pins for the cord.
 
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andyjax

Well-Known Member
Joined
Jul 15, 2014
Messages
45
Location
Georgia
Thanks Dave. Hope that's not it. Where do you think the steam under the bottom of the engine is coming from? Only happens after the temp creeps to the yellow mark. There's a small coolant line running under the engine to somewhere but I can't see the front side of the engine ( closest to the cab ) even when raising the cab and the engine running.
 
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Welder Dave

Senior Member
Joined
Oct 11, 2014
Messages
12,548
Location
Canada
Can you take a belly pan off and look up from underneath? It could be something as simple as a loose clamp or a pin hole in a hose. Drive it up on some planks or block it up to get more ground clearance. You have to find a way to look to see where the leak is coming from. A constant running brush hog would add a lot of heat especially without an aux. hyd. cooler. All the hyd. heat and constant load would certainly contribute to the engine getting hotter.
 
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DIYDAVE

Senior Member
Joined
Feb 18, 2007
Messages
2,420
Location
MD
Sometimes you can use a selfie stick, or strap a phone, to something, and maneuver it to take a picture or video, of the leak...;)
 
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andyjax

Well-Known Member
Joined
Jul 15, 2014
Messages
45
Location
Georgia
I'll give the belly pan idea a try. Didn't know I could take it off. I'll have to check and see if I have a hydraulic cooler stacked with the radiator but pretty sure I do. Where would an aux cooler be? I have a high flow option but don't know if it works. Think I should be using it with that bush hog? The bush hog is a lower flow model - says not to exceed 20 GPM. What does the high flow do? Never used it but the button lights up when I press it. I've always used the machine in the regular mode. Maybe that's the problem? Thanks again.
 
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