McCulloch MAC GBV 345 User Manual (English)

Questions and Answers:

J
James SchmidtJul 30, 2025
Why won't my McCulloch MAC GBV 345 Blower engine start?
- M
  myersblakeJul 30, 2025
  There are several reasons why your McCulloch Blower engine might not start. It could be due to a flooded engine (refer to the “Starting Instructions”), an empty fuel tank (fill it with the correct fuel mixture), a faulty spark plug (install a new one), fuel not reaching the carburetor (check for a dirty fuel filter and replace it, or inspect the fuel line for kinks or splits and repair or replace it). In case of low compression, it is better to contact an authorized service dealer.
M
Ms. Rose BauerAug 5, 2025
What to do if McCulloch MAC GBV 345 engine will not accelerate, lacks power, or dies under a load?
- A
  Amanda GarciaAug 5, 2025
  If your McCulloch blower engine won't accelerate, lacks power, or dies under a load, consider these potential causes: a dirty air filter (clean or replace it), fuel not reaching the carburetor (check and replace the fuel filter if dirty, and check fuel lines for kinks or splits), a fouled spark plug (clean, replace, and re-gap it), or a clogged spark arresting screen (replace it). For carburetor adjustments, carbon build-up, or low compression, contact an authorized service dealer.
K
kevin67Aug 10, 2025
Why McCulloch MAC GBV 345 Blower engine smokes excessively?
- S
  Sandra BrownAug 10, 2025
  Excessive smoke from your McCulloch Blower engine can be attributed to several factors. The choke might be partially on (adjust the choke), the fuel mixture could be incorrect (empty the tank and refill with the correct mixture), or the air filter might be dirty (clean or replace it). If these steps don't resolve the issue, the carburetor may require adjustment, and you should contact an authorized service dealer.
D
Dillon HayesAug 17, 2025
What to do if McCulloch MAC GBV 345 Blower engine will not idle properly?
- C
  charles21Aug 17, 2025
  If your McCulloch Blower engine won't idle properly, possible causes include fuel not reaching the carburetor (check for a dirty fuel filter and replace it; also, check for kinked or split fuel lines and repair or replace them). For carburetor adjustments, worn crankshaft seals, or low compression, it is necessary to contact an authorized service dealer.
M
Matthew HallAug 23, 2025
Why is my McCulloch Blower engine running hot?
- R
  Robert CurtisAug 23, 2025
  If your McCulloch Blower engine is running hot, it could be due to an incorrect fuel mixture (refer to “Fueling Your Unit”), or an incorrect spark plug (replace it with the correct one). For carburetor adjustments or carbon build-up issues, please contact an authorized service dealer.

McCulloch MAC GBV 345 Specifications

Engine Specifications

engine displacement	25 cm[3]
maximum engine power	0, 75 kW
idle speed	3700 rpm

Volume

fuel tank volume	540 cm[3]

Sound Pressure Levels

blower sound pressure level at idling	76, 6 dB(A)
blower sound pressure level at racing	96, 7 dB(A)
vacuum sound pressure level at idling	81, 0 dB(A)
vacuum sound pressure level at racing	98, 6 dB(A)

Sound Power Levels

sound power level, measured	103, 9 dB(A)
sound power level, guaranteed	108, 0 dB(A)

Vibrations

blower vibrations at idling, top handle	4, 5 m/s[2]
blower vibrations at racing, top handle	13, 6 m/s[2]
vacuum vibrations at idling, left/rear handle	2, 7/2, 5 m/s[2]
vacuum vibrations at racing, left/rear handle	11, 4/14, 5 m/s[2]

Weight and Dimensions

weight without tubes	4, 4 kg

View in Manual

Summary

Instruction Manual

Key to Symbols

Safety Rules

Know Your Unit

Read and understand manual before operating. Restrict unit to users who understand rules.

Plan Ahead

Wear eye/ear protection, foot protection, and respirator in dusty environments.

Handle Fuel with Caution

Eliminate spark sources, mix/pour fuel outdoors, do not smoke while handling fuel.

Operate Your Unit Safely

Stop engine before opening vacuum inlet. Inspect unit before use. Never start engine inside.

Maintain Your Unit Properly

Have maintenance done by authorized dealer. Disconnect spark plug before maintenance.

What is What?

Assembly

Blower Assembly

Instructions for assembling blower tubes and high-speed nozzle.

Blower Tube Assembly

Align rib on upper tube with groove in outlet; slide tube into place.

High-Speed Nozzle Assembly

Align slots on nozzle with tabs on lower blower tube; secure nozzle.

Vacuum Bag Assembly

Open vacuum bag, insert elbow tube, close zipper.

Vacuum Assembly

Instructions for attaching vacuum tubes and vacuum inlet cover.

Vacuum Tube Assembly

Align tabs on vacuum inlet with slots on upper tube; push and turn to secure.

Convert Unit from Vacuum to Blower Use

Remove elbow tube, vacuum bag, and vacuum tubes to convert to blower.

Shoulder Strap Adjustment

Adjust shoulder strap so seam lies between thumb and index finger.

Operation

Operating Position

Hold unit with muffler side away from body. Wear hearing and eye protection.

Operating Tips

Reduce hearing loss risk. Stop engine before removing attachments. Operate at reasonable hours.

Before Starting Engine

Read fuel information. Ensure tubes are secure. Move away from fueling site.

Fueling Engine

Use unleaded petrol mixed with 2-cycle oil at 40:1 ratio. Remove fuel cap slowly.

How to Stop Your Engine

Release throttle trigger and push/hold STOP switch until engine stops.

Starting a Cold Engine

Press primer bulb 6 times, move start lever to START, pull starter rope sharply.

Starting a Warm Engine

Squeeze throttle trigger and pull starter rope sharply until engine starts.

Starting a Flooded Engine

Move start lever to RUN, squeeze throttle trigger, pull starter handle repeatedly.

Maintenance

Check Fasteners, Parts, and Labels

Check for loose/damaged parts, inspect unit & labels. Clean unit after use.

Clean Air Filter

Clean filter after 5 hours or yearly. Wash in soap and water, allow to dry.

Replace Spark Plug

Replace spark plug yearly for easier starting. Set gap at 0.6 mm.

Replace Fuel Filter

Drain unit dry, remove fuel cap assembly, pull filter from tank, install new filter.

Check Muffler Mounting Screws

Ensure muffler mounting screws are secure and tightened properly once a year.

Inspect Muffler and Spark Arresting Screen

Remove carbon deposits from muffler and screen to prevent fire hazard.

Carburetor Adjustments

Adjust idle speed if engine stalls or dies. Turn idle speed screw clockwise to increase.

Storage

Prepare unit for storage if not used for 30 days. Store in ventilated area. Empty fuel tank.

Troubleshooting Table

Declaration of Conformity

Technical Data

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