Cub Cadet MTD 70 Series - Manual (Page 55)

F UEL S YSTEM AND G OVERNOR
49
Primers
MTD engines use a dry bulb primer. This means that
there is no fuel in the primer bulb. The primer works by
pushing air into the float chamber of the carburetor when
the primer bulb is depressed. This will force fuel to be
sprayed out of the main nozzle into the throat of the carbu-
retor.
To test the primer:
1. Remove the engine shroud by following the steps
described in Chapter 3: Air Intake Systems.
2. Reconnect the primer hose to the carburetor. See
Figure 4.15.
3. Press the primer bulb while looking down the carbu-
retor throat. If there is fuel squirting into the carbure-
tor throat the primer is working properly. If not,
replace the primer and hose.
NOTE: The primer and primer hose come as an
assembly so there is no need to determine which part is bad.
To replace the primer:
4. If the primer is bad, disconnect hose from the carbu-
retor.
5. Remove the hose camp at the rear of the primer
bulb. See Figure 4.16.
6. The primer is held to the shroud by a pair of split,
barbed posts. Squeeze the posts to release the
barbs. See Figure 4.16.
NOTE: The primer bulb and hose will slide out as an
assembly.
7. Install the new primer by following the above steps
in reverse order.
Figure 4.15
Primer hose
Carburetor throat
Figure 4.16
Clamp
Tabs