Marshalltown 800MP Mixer - Manual (Page 10)

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TROUBLE SHOOTING GUIDE FOR MP MIXERS.
ENGINE WON’T START:
1. Check for sufficient fuel.
2. Check oil level (some engines have an oil alert, preventing the engine from starting
when oil level is low)
3. Was engine choked when starting?
4. Is engine flooded?
5. Check spark plug. (Clean and check gap).
6. If engine still won’t start, take to service center.
BELT DRIVEN MODELS:
1. Check condition of belts, replace if necessary.
2. Check for oil or grease on belts as well as for loose belts.
3. Adjust set screw under engine base down until belts are tight.
TRANSMISSION DRIVEN MODELS.
CLUTCH SLIPS:
1. Remove spark plug wire.
2. Remove side cover on transmission.
3. Loosen set screw on clutch and adjust clutch clockwise a couple of notches at a time
until paddles turn and have a firm pressure on the clutch handle.
TRANSMISSION TURNS BUT PADDLE ARMS WON’T:
1. Check if shear bolt on coupler is broken and has fallen out.
HYDRAULIC DRIVEN MODELS.
PADDLE ARMS WON’T TURN:
1. Check if clutch rod has been bent or broken.
2. Check if flow control valve moves in forward position.
IF VALVE DOES NOT GO INTO FORWARD POSTION CHECK THE
FOLLOWING:
1. Check if linkages are free.
2. Remove stem set screw (Fig 1) and put a few drops of oil in stem.
3. Replace set screw but do not overtighten.
PADDLE ARMS STOP WHEN DRUM IS FILLED:
1. Remove cap (Fig 2) and set pressure up by tightening threaded screw with allen
wrench no more than ¼ turn at a time. Valve pressure is set at 1500 psi at factory.
Each ¼ turn will increase the pressure by 250 psi. After each ¼ turn check to see if
paddles turn (CAUTION) maximum pressure of valve is 3000 psi.
REVERSE TOO FAST OR TOO SLOW:
1. Loosen set screw on knob (Fig. 3)
2. Turn knob a small amount at a time clockwise to slow movement and
counterclockwise to speed up movement