Cub Cadet MTD 70 Series - Manual (Page 58)

61/65/70/75 Series Horizontal Shaft Engines
52
Roll over valve vent
To remove/replace the roll over valve:
1. Gently pry the roll over valve out of the fuel tank.
See Figure 4.19.
2. Inspect the rubber grommet, replace if damaged.
3. Disconnect the vacuum line.
NOTE: if the roll over valve is being removed to
remove/replace the fuel tank, the vacuum
line can remain attached.
4. With the grommet on the roll over valve, install the
roll over valve by pressing it into the opening in the
tank.
5. Install the vacuum line.
6. Test run the engine in a safe area before returning
to service.
Testing the roll over valve
The roll over valve vent has two functions. The first
function is to vent the tank and the second function is to
close off the vent if the tank is inverted.
Test the roll over valve by:
1. Remove the roll over valve by following the steps
described above.
2. Connect a vacuum pump to the roll over valve.
3. Hold the roll over valve in an inverted position.
4. Apply a vacuum to the roll over valve. See Figure
4.20.
NOTE: The roll over valve should hold 15 in.Hg. for
15 seconds.
5. With the vacuum still applied, turn the roll over valve
over. See Figure 4.21.
NOTE: The vacuum should be relieved.
6. If the results do not match what is listed above,
replace the roll over valve.
Figure 4.19
Gently pry out the roll over valve and grommet
Figure 4.20
15 in.Hg.
Figure 4.21
Zero reading