MTD 173 cc OHV - User Manual

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MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019

Printed In USA

Safe Operation Practices • Set-Up • Operation • Maintenance • Troubleshooting • Warranty

WARNING

READ AND FOLLOW ALL SAFETY RULES AND INSTRUCTIONS IN THIS MANUAL

BEFORE ATTEMPTING TO OPERATE THIS MACHINE.

FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

OperatOr’s Manual

173 cc OHV Vertical Shaft Engine

Form No. 769-07391B

(December 6, 2012)

Questions and Answers

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Phillip FreemanAug 16, 2025
What to do if MTD 173 cc OHV Engine runs erratic?
- M
  Megan LittleAug 16, 2025
  If your MTD Engine runs erratically, start by checking the spark plug boot to ensure it's securely connected and tightened. A loose connection can cause inconsistent performance. Also, check for reduced fuel flow or a blocked fuel filter and replace the fuel filter as instructed in the Maintenance section. Make sure the vent in the gas cap isn't plugged, as this can affect fuel delivery. Additionally, water or dirt in the fuel system can cause erratic running, so drain the fuel tank and refill it with fresh fuel. If equipped with a choke, make sure the unit is not running with the choke applied; push the choke knob in to disengage it.
S
scott95Oct 30, 2025
Why MTD 173 cc OHV fails to start?
- C
  Christopher HowardOct 30, 2025
  If your MTD Engine fails to start, there are several potential causes. First, ensure the blade control is engaged (lawn mower only). Check that the spark plug boot is connected. Make sure the fuel tank isn't empty or contains stale fuel; if so, fill it with clean, fresh gasoline. If equipped, verify the fuel shut-off valve is open and the engine is properly primed as instructed in the Operation section. Inspect the spark plug for faults and clean, adjust the gap, or replace it if necessary. Additionally, check for reduced fuel flow or a blocked fuel filter, and replace the fuel filter as instructed in the Maintenance section. If the engine is flooded, wait a few minutes before restarting, and avoid priming. If equipped with a choke, ensure the engine is choked appropriately, referring to t...