Bobcat T200 case drain

[smiley.keith]

I am adding a case drain to my T200. Where does the hose (item 11) get connected to? Thanks

 

[fortworth-cowboy]

Hydraulic Tank

 

[smiley.keith]

There is a cap on top of the hydraulic tank that I thought about modding to get the case drain connected to the tank. Unfortunately the back of the cab covers it. I ended up using an elbow with a tapered side for the hydraulic hose and the other side of the fitting is 3/4" pipe thread with O rings and a nut inside the fill tube to secure it. I drilled a 3/4" hole in the fill tube to attach.

 

[fortworth-cowboy]

View attachment 8943There is a cap on top of the hydraulic tank that I thought about modding to get the case drain connected to the tank. Unfortunately the back of the cab covers it. I ended up using an elbow with a tapered side for the hydraulic hose and the other side of the fitting is 3/4" pipe thread with O rings and a nut inside the fill tube to secure it. I drilled a 3/4" hole in the fill tube to attach.

Well that is one way, but will properly leak soon.

 

[smiley.keith]

Well that is one way, but will properly leak soon.

I didn't want to drill into the tank and create a future leak so thought going into the hose would be better. By going into the hose if it did leak I could always replace the hose. I think the fitting I used (attached) with a o ring on both the outside and inside of the hose with a nut to secure would be my best choice. Any drainage from the case line would be low pressure.

 

[MX727]

That isn't a pipe thread. That is SAE O-ring. They will thread into pipe fittings, but they usually end up leaking, particularly if you thread a male pipe into a female SAE O-ring.

SAE fitting thread portions are straight, while NPT fittings are tapered.

 

[smiley.keith]

That isn't a pipe thread. That is SAE O-ring. They will thread into pipe fittings, but they usually end up leaking, particularly if you thread a male pipe into a female SAE O-ring.

SAE fitting thread portions are straight, while NPT fittings are tapered.

 

[smiley.keith]

Agree the elbow is SAE and tapered on the end where hydraulic hose attaches. The other end of the elbow is 3/4" pipe thread. I attached a 3/4 nut inside the large filler hose with o rings outside and inside. Even if there is leaking between the pipe thread and nut it's inside the filler tube so shouldn't leak externally. Like I mentioned I can replace the large filler hose if this doesn't work but if I drill directly into the tank and it leaks there I'm stuck with the problem.

 

[MX727]

So, there wasn't any clearance to get an elbow into that existing port on the tank? I just did this on an excavator and they also had a port like yours, which was where the case drain was meant to go.

If you do end up drilling the tank, weld it or have it welded. That's what I did on the previous excavator which didn't come with the port like the new ones.

 

[smiley.keith]

So, there wasn't any clearance to get an elbow into that existing port on the tank? I just did this on an excavator and they also had a port like yours, which was where the case drain was meant to go.

If you do end up drilling the tank, weld it or have it welded. That's what I did on the previous excavator which didn't come with the port like the new ones.

The existing port on top of the hydraulic tank is covered by the cab which extends a couple inches behind and only 1" above the port. There wasn't a way to get fittings into it with that close clearance. The hydraulic tank on the T200 is plastic and I didn't want to drill into it and cause a leak. My best solution was to cut. 3/4' hole in the fill tube. If that leaked it could be replaced. The fitting in the pictures above has been running now for hours and there is no sign of leaks.