Dolmar PM-46 B - User Manual

Questions and Answers

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robinphillipsAug 4, 2025
Why is my Dolmar PM-46 B Lawn Mower engine difficult to start or losing power?
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  Ashley KlineAug 4, 2025
  If your Dolmar Lawn Mower engine is hard to start or is losing power, it could be due to dirt, water, or stale fuel in the tank. Drain the fuel and clean the tank, then fill it with clean, fresh fuel. Another possibility is a plugged vent hole in the fuel tank cap; clean or replace the cap. Also, a dirty air cleaner element can cause these issues, so clean the air cleaner element.
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Jeffrey WilliamsAug 8, 2025
What to do if Dolmar Lawn Mower engine overheats?
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  Ronald GayAug 8, 2025
  If your Dolmar Lawn Mower engine is overheating, it might be due to restricted cooling airflow. Remove any debris from the slots in the shroud, blower housing, and air passages. Another cause could be an incorrect spark plug. Install an RC12YC spark plug and ensure the cooling fins are properly attached to the engine.
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mariestuartAug 12, 2025
Why does Dolmar PM-46 B Lawn Mower engine operate erratically?
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  Leah LunaAug 12, 2025
  An erratic engine operation in your Dolmar Lawn Mower can stem from a defective spark plug. Replace it with a new, correctly gapped plug as detailed in the ENGINE OWNERS MANUAL. An incorrect spark plug gap (set it to 0.7 to 0.8 mm) or a dirty air cleaner element (clean it as described in the ENGINE OWNERS MANUAL) can also cause this issue.
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Scott ChandlerAug 17, 2025
What to do if Dolmar PM-46 B Lawn Mower vibrates abnormally?
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  uhicksAug 17, 2025
  Abnormal vibration in your Dolmar Lawn Mower may be due to a loose cutting assembly. Try tightening the blade. If the vibration persists, the cutting assembly might be unbalanced, and you should balance the blade.
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Christine PattersonAug 21, 2025
Why Dolmar Lawn Mower engine idles poorly?
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  Nathaniel WelchAug 21, 2025
  Poor idling in your Dolmar Lawn Mower could be caused by a dirty air cleaner element, so clean it as described in the ENGINE OWNERS MANUAL. Alternatively, air slots in the engine shroud might be blocked; remove any debris from the slots. Also, check for blockages in the cooling fins and air passages under the engine blower housing and remove any debris.
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Jessica YoungAug 26, 2025
Why Dolmar PM-46 B Lawn Mower engine skips at high speed?
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  Kelly Ryan DDSAug 26, 2025
  If your Dolmar Lawn Mower engine skips at high speed, the gap between the spark plug electrodes may be too close. Set the gap between the electrodes to 0.7 to 0.8 mm.
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angela60Oct 30, 2025
Why Dolmar Lawn Mower engine does not start?
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  Erika LoveOct 30, 2025
  Your Dolmar Lawn Mower engine might fail to start due to several reasons. The throttle choke may not be in the correct position; adjust it accordingly. The fuel tank could be empty, requiring you to fill it, referring to the ENGINE OWNERS MANUAL. A dirty air cleaner element can also prevent starting; clean it as described in the ENGINE OWNERS MANUAL. Other potential causes include a loose spark plug (tighten to 25-30 Nm), a disconnected spark plug wire (reinstall it), an incorrect spark plug gap (set it to 0.7 to 0.8 mm), a defective spark plug (replace it, referring to the ENGINE OWNERS MANUAL), or a carburetor flooded with fuel (remove the air cleaner element and pull the starter rope until the carburetor clears, then reinstall the element). If none of these resolves the issue, the ignit...

Summary

General Safety Rules

Technical Data

Assembly

Folding Handle

Use the locking knob to fix the lower handlebars into the unit body.

Adjustment for Appropriate Angle

Mounting the Grass Catcher

Height of Cut

Apply outward pressure to disengage lever from rack to adjust height.

Operating Instructions

Before Starting

Service the engine with gasoline and oil as instructed in the separate engine manual.

To Start Engine and Engage Blade

Press the primer bulb, set choke, grasp brake handle and pull starter handle.

Operation Procedures

To Stop Engine

Release the brake control handle to stop the engine and blade.

Connection for Auto Move

Height Adjustment Instructions

Stop mower and disconnect spark plug cable before changing height.

Maintenance Instructions

Blade Mounting Torque

Cleaning

Cutting Blade

Storage Instructions (Off Season)

Empty Fuel Tank

Troubleshooting Guide

Engine Does Not Start

Check throttle choke position and fuel tank level.

Engine Difficult to Start or Loses Power

Check air cleaner, spark plug, and fuel quality.

Engine Operates Erratically

Inspect spark plug gap and check for fuel flooding.

Engine Idles Poorly

Engine Overheats

Mower Vibrates Abnormally

Dolmar PM-46 B Specifications

General

Cutting Width	46 cm
Engine Type	4-stroke
Cutting Height	25-75 mm
Grass Catcher Volume	60 L
Fuel Tank Capacity	0.8 L
Displacement	140 cc
Cutting Height Adjustment	Central
Engine	B&S 500E series