McCulloch MC20H42YT - User Manual

McCulloch MC20H42YT

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REPAIR PARTS MANUAL

MODEL NO. MC20H42YT (96048002700)

LAWN TRACTOR

01.23.12 BD

532 44 66-64 Printed in the U.S.A.

www.mcculloch.biz

Table of Contents

Questions and Answers

P
Patricia MitchellAug 22, 2025
How to troubleshoot a McCulloch MC20H42YT Lawn Mower that is hard to start?
- V
  vglennAug 22, 2025
  If your McCulloch Lawn Mower is hard to start, consider these possible causes: a dirty air filter (clean or replace it), a bad spark plug (replace it), a weak or dead battery (recharge or replace it), a dirty fuel filter (replace it), or stale or dirty fuel (empty the tank and refill with fresh, clean gas). Also, check for loose or damaged wiring. If the problem persists, the carburetor or engine valves might need adjustment, which may require a visit to an authorized service center.
M
Miss Melissa MendozaAug 25, 2025
What to do if McCulloch MC20H42YT engine will not turn over?
- N
  Nicholas PalmerAug 25, 2025
  If the engine of your McCulloch Lawn Mower won't turn over, make sure the brake pedal is depressed and the attachment clutch is disengaged. Also, check the battery; it may be weak or dead and need recharging or replacement. Inspect the fuse and replace it if it's blown. Clean any corrosion from the battery terminals. Check all wiring for looseness or damage. If these steps don't resolve the issue, the ignition switch, solenoid, or starter may be faulty and need checking or replacement. If the problem persists, the operator presence switch(es) might be faulty, and you should contact an authorized service center.
R
Ronald CastilloAug 26, 2025
What causes a McCulloch MC20H42YT to click but not start?
- C
  Cynthia LucasAug 26, 2025
  If your McCulloch Lawn Mower engine clicks but won't start, the battery may be weak or dead, requiring a recharge or replacement. Also, check for corroded battery terminals and clean them. Inspect all wiring for looseness or damage. The solenoid or starter may also be faulty and need checking or replacement.
E
Edwin EdwardsAug 30, 2025
Why does my McCulloch MC20H42YT have poor grass discharge?
- F
  Felicia MillerAug 30, 2025
  If your McCulloch Lawn Mower has poor grass discharge, ensure the engine speed isn't too slow by placing the throttle control in the 'FAST' position. Check that your travel speed isn't too fast and shift to a slower speed if needed. Avoid mowing wet grass, and make sure the mower deck is level. Inspect the tires for proper air pressure. Check the blade; replace it if it's worn, bent, or loose, and tighten the blade bolt. Clean any buildup of grass, leaves, or trash under the mower. If the mower drive belt is worn, replace it. Ensure the blades are installed with the sharp edge down. If you're using improper blades, replace them with the blades listed in the parts manual. Finally, clean around the mandrels to open vent holes if they are clogged.
J
John MarshallSep 1, 2025
How to fix excessive vibration in a McCulloch MC20H42YT Lawn Mower?
- M
  Mr. Eric Cummings PhDSep 1, 2025
  Excessive vibration in your McCulloch Lawn Mower could be due to a worn, bent, or loose blade; replace the blade and tighten the blade bolt. A bent blade mandrel could also be the cause, so replace it if necessary. Check for any loose or damaged parts and tighten or replace them accordingly.
A
Alex LucasSep 3, 2025
Why is my McCulloch MC20H42YT cutting unevenly?
- A
  alexander39Sep 3, 2025
  An uneven cut with your McCulloch Lawn Mower can stem from several causes. The blade might be worn, bent, or loose, so replace it and tighten the blade bolt. Ensure the mower deck is level. Clean any buildup of grass, leaves, or trash under the mower. A bent blade mandrel can also cause an uneven cut, so replace it if necessary. Lastly, check for clogged mower deck vent holes from buildup of grass, leaves, and trash around mandrels, and clean around the mandrels to open vent holes.
K
Kathryn MckeeSep 5, 2025
What to do if McCulloch MC20H42YT blades will not rotate?
- C
  Connie ReidSep 5, 2025
  If the mower blades of your McCulloch Lawn Mower will not rotate, there might be an obstruction in the clutch mechanism; remove it. The mower drive belt could be worn or damaged, so replace it if needed. A frozen idler pulley or blade mandrel could also be the culprit, so replace them if necessary.
D
Deanna GreenSep 7, 2025
Why are the headlights not working on my McCulloch MC20H42YT Lawn Mower?
- S
  stephanievaldezSep 7, 2025
  If the headlight(s) on your McCulloch Lawn Mower aren't working, first ensure the switch is turned 'ON'. If that's not the issue, the bulb(s) or lamp(s) may be burned out, so replace them. A faulty light switch could also be the problem, so check or replace it. Inspect the wiring and connections for looseness or damage. Finally, check the fuse and replace it if it's blown.
Z
zsmithSep 9, 2025
What causes a McCulloch MC20H42YT Lawn Mower battery to not charge?
- L
  lauriewilsonSep 9, 2025
  If the battery of your McCulloch Lawn Mower will not charge, it may have bad battery cell(s), requiring a replacement. Check and clean all cable connections. If the issue persists, the regulator or alternator may be faulty and need replacement.
C
Crystal AcostaSep 12, 2025
Why am I experiencing loss of drive on my McCulloch Lawn Mower?
- Q
  qcowanSep 12, 2025
  If your McCulloch Lawn Mower experiences a loss of drive, ensure the freewheel control is in the 'engaged' position. If equipped, check for debris on the steering plate. A worn, damaged, or broken motion drive belt should be replaced. If air is trapped in the transmission, purge it.

McCulloch MC20H42YT Specifications

General

Brand	McCulloch
Model	MC20H42YT
Category	Lawn Mower
Language	English

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