Bobcat 773G Hydraulic Leak

[clintrobbins]

After working okay all day, the temperature gauge started displaying erratically. Finally, it went to COLD and the glow plugs went through maximum warm-up before starting a warm engine. While checking coolant, etc., I discovered that hydraulic fluid had been spraying out of both sides of the machine. I couldn't see the leak from the engine compartment and haven't lifted the cab yet. Since everything is still operating okay, what are likely sources of the leak?

 

[clintrobbins]

Update: It appears that the hydraulic cooling condenser is leaking and that the fan is blowing the fluid around as well as out the outlets. I don't have time tonight to check, but is it possible that the fluid is affecting the coolant temperature wiring, sensor, etc., or is it likely that it's a coincidence that the temperature gauge problem occurred at the same time?

 

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Update: It appears that the hydraulic cooling condenser is leaking and that the fan is blowing the fluid around as well as out the outlets. I don't have time tonight to check, but is it possible that the fluid is affecting the coolant temperature wiring, sensor, etc., or is it likely that it's a coincidence that the temperature gauge problem occurred at the same time?

yes it is possible for the oil cooler to leak and the fan can blow right out the sides. the oil cooler is right in the shroud. its probably coated everything.

 

[reaperman]

Update: It appears that the hydraulic cooling condenser is leaking and that the fan is blowing the fluid around as well as out the outlets. I don't have time tonight to check, but is it possible that the fluid is affecting the coolant temperature wiring, sensor, etc., or is it likely that it's a coincidence that the temperature gauge problem occurred at the same time?

Does your machine go thru the glow plug cycle while it is running? If so, hydraulic fluid may have gotten on the flywheel somehow and is effecting the rpm sensor. The sensor is that threaded "pipe" that's bolted into the right hand side of the flywheel, a little above and to the right of the battery.

 

[clintrobbins]

Does your machine go thru the glow plug cycle while it is running? If so, hydraulic fluid may have gotten on the flywheel somehow and is effecting the rpm sensor. The sensor is that threaded "pipe" that's bolted into the right hand side of the flywheel, a little above and to the right of the battery.

Update: I had the oil cooler repaired and that was the only leak. The temperature gauge now moves all the way to COLD when the key is turned on and stays there. The ENGINE COOLANT TEMPERATURE warning light stays on all of the time now, but the engine isn't overheating. Is the temperature sensor the likely problem? Where is it located?

 

[clintrobbins]

Update: I had the oil cooler repaired and that was the only leak. The temperature gauge now moves all the way to COLD when the key is turned on and stays there. The ENGINE COOLANT TEMPERATURE warning light stays on all of the time now, but the engine isn't overheating. Is the temperature sensor the likely problem? Where is it located?

Anyone?

 

[farmshop]

Anyone?

is there coolant in the engine. The sensor needs to be immersed to work.

 

[clintrobbins]

is there coolant in the engine. The sensor needs to be immersed to work.

The coolant is a little above full.

 

[clintrobbins]

The coolant is a little above full.

Does anyone know where the sensor is located?

 

[Tazza]

Does anyone know where the sensor is located?

The temperature sender should be mounted in the thermostat housing. The thermostat housing is the alloy piece that bolts to the end of the cylinder head.