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User manuals for 1990s yard equipment tend to be hard to find. Fortunately, the basic operating instructions for a McCulloch MAC 2816 string trimmer are similar to those of many similar gas trimmers. Keeping weed trimmers running requires periodic cleaning of external and internal components, proper fuel and oil mix, and using the trimmer only for the tasks it was designed for, such as trimming long grass and weeds.
MAC 2618 Anatomy
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Once you know the MAC 2618's basic parts, you'll be familiar with your machine and better able to use and maintain it. The McCulloch MAC 2816 consists of a string head, debris shield, handle and engine assembly attached to a metal drive shaft. Components of the engine assembly you should be able to see include a hand grip with throttle trigger, starter pull handle, spark plug and plug wire, ignition switch, air filter cover, fuel tank, fuel primer bulb, choke lever and muffler shield. You can get to the spark arrester through the bottom opening in the muffler shield.
Disassembling the String Head
You'll need to disassemble the string head to inspect or replace the trimmer line on the e MAC 2618. Turn the trimmer off, place it on the ground or a sturdy table and turn the retaining knob -- also called bump knob -- on the bottom of the head counterclockwise with your fingers or a wrench. When you've removed the knob, slide the line spool and tension spring off the shaft to reveal the line. Take care not to misplace the retaining knob or spring.
Replacing Trimming Line
Measure and cut 18 feet of 0.080- or .095-inch plastic cutting line. Insert both ends into one set of paired holes on the spool's center -- one end through one hole, the other through the remaining hole. Pull both ends though the holes evenly and completely until no slack remains and line is securely looped through the spool holes. Beginning at the spool, grasp both strings and wrap them evenly in a clockwise direction around the spool until you're left with approximately 6 inches of line. Insert one string end through one of two opposing external spool holes, repeating with the other string end end through the opposite hole. Reassemble the string head in the reverse order in which you disassembled it and trim the exposed line to 5 inches or less before starting the McCulloch MAC 2816.
Fuel and Oil Mixture Is Essential
Mix fresh gasoline in a 40:1 ratio with any high-quality two-stroke engine oil in an approved gasoline container for the McCulloch MAC 2816. Pour one-half of the gasoline in to the container, add the proper amount of two-stroke oil -- detailed instructions with sample fuel and oil quantities will be printed on the oil container. Add the remaining gasoline, cap the container and swirl gently to mix. If the gasoline will be stored for more than one month, add fuel stabilizer to the mixture, following label instructions. Using old or untreated gasoline may cause hard starting and poor engine performance. You can also buy ready-mixed oil and fuel at home improvement stores.
Starting a Cold or Warm Engine
Start a cold McCulloch MAC 2816 by placing the trimmer on the ground. Ensure the ignition switch is in the 'on' position. Slide the choke lever to the marked 'choke' position and press the rubber carburetor priming bulb 10 times. Grasp the grip with one hand while pulling up on and holding the throttle trigger with your finger. Pull the starter handle four times, slide the choke lever to the 'start' position and pull the start handle four more times until the engine is running. Once the engine has run for 10 seconds, slide the choke lever to 'run' and release the throttle trigger. If the engine fails to start, start over from the beginning. To start a warm engine, depress the throttle trigger, slide the choke lever to 'start' or 'run' and pull the starter handle four times. To shut the engine down, turn the switch to the 'off' position.
Maintenance Tips
Ensure the engine switch is turned to 'off' and the engine is cool before performing maintenance on the McCulloch MAC 2816. Clean the spark plug by gently pulling the wire boot off. Insert a spark plug wrench and remove the plug by turning counterclockwise and pulling the plug outward. Inspect the electrode, clean it with emery cloth, if necessary, check for 0.025-inch gap and adjust if needed with a spark plug gap tool. If the ceramic insulation is cracked, install a new spark plug. Clean the air filer by removing the two air filter cover screws with a screwdriver. Remove the air filter, wash it with soap and water, allow it to air dry and reinstall it. Clean or replace the spark arrester screen by inserting a screwdriver into the slot in the muffler shield. Turn the retaining screw counterclockwise and remove the spark arrester cover and screen. Clean the screen with a utility brush or replace it if it is damaged.
References (3)
Resources (2)
About the Author
Matt McKay began his writing career in 1999, writing training programs and articles for a national corporation. His work has appeared in various online publications and materials for private companies. McKay has experience in entrepreneurship, corporate training, human resources, technology and the music business.
Cite this ArticleChoose Citation Style
Illustrated parts list, Manufacturing • sales • service, Torque specifications
McCulloch products are identified by a model number (in this instance
400128) followed by a suffix number (01). Suffix numbers denote
variations in parts or assemblies used in the manufacture of this
product.
Illustrated Parts Lists (IPLs) contain a PART NUMBER, DESCRIPTION,
UNITS per assembly and STOCKING CODE for each part.
Stocking Codes are:
A - Dealer stocked. Fast to medium moving part.
B - Distributor stocked. Medium to slow moving part.
C - Factory stocked. Slow moving part.
NOTE:
The following explains symbols and footnotes in this IPL:
(-)
A dash preceding a PART NUMBER indicates that it is a
new part number, different from the one listed in the
previous IPL for this unit.
(.)
One or more dots (. Spring, Starter) preceding a part
DESCRIPTION indicates the part is included in the kit or
assembly described directly above the dot(s).
(-- --)
If four dashes appear in place of a PART NUMBER, the
part is not available individually but is included in the next
higher assembly or subassembly.
Circled numbers preceding a DESCRIPTION footnote the
part or assembly to additional information on the page.
(*)
An asterisk denotes that choices follow or precede.
(†)
Serial Number Prefix 22- denotes CARB approved unit --
all parts are interchangeable with Serial Number
Prefix 12-.
The policy of McCulloch is one of continual improvement in design,
manufacturing and engineering advancement wherever possible to
assure still finer power tools. Hence, specifications, equipment colors,
design and manufacturer’s suggested list prices are subject to change
without notice. McCulloch reserves the right to make such changes
without prior notification or obligation to backfit or supply backfit
components for units previously shipped from the factory.
(†)SERIAL
MODEL
NUMBER
MODEL
ENGINE
NAME
PREFIX
NUMBER
SIZE
DRIVE SHAFT HANDLE
MT3310
-
-
28cc DIRECT 44”
D
MT3311
-
-
32cc CLUTCH 48”
D
MAC 1385L
22-
400132-93
32cc CLUTCH 48”
D
MAC 2816
12- / 22- 400128-01
28cc DIRECT 44”
D
MAC 2816
12- / 22- 400128-19
28cc DIRECT 44”
D
MAC 2816
12- / 22- 400128-21
28cc DIRECT 44”
D
MAC 2816
12- / 22- 400128-27
28cc DIRECT 44”
D
MAC 2816
12- / 22- 400128-51
28cc DIRECT 44”
D
MAC 2816
12- / 22- 400128-73
28cc DIRECT 44”
D
MAC 2816
12-
400128-85
28cc DIRECT 44”
D
MAC 2816
12- / 22- 400128-93
28cc DIRECT 44”
D
MAC 2816
22-
400128-97
28cc DIRECT 44”
D
MAC 2818
12- / 22- 400128-02
28cc CLUTCH 48”
D
MAC 2818
12- / 22- 400128-30
28cc CLUTCH 48”
D
MAC 2818
12- / 22- 400128-58
28cc CLUTCH 48”
D
MAC 2818
12- / 22- 400128-94
28cc CLUTCH 48’
D
Eager Beaver 282
12-
400128-05
28cc DIRECT 44”
D
Eager Beaver 282
12-
400128-47
28cc DIRECT 44”
D
Eager Beaver 287
12-
400128-10
28cc CLUTCH 48”
D
Eager Beaver 287
12
400128-28
28c CLUTCH 48”
D
Eager Beaver 287
12-
400128-48
28cc CLUTCH 48”
J
Eager Beaver 287
12-
400128-52
28cc CLUTCH 48”
D
ProMac I Super
12- / 22- 400132-01
32cc DIRECT 48”
J
ProMac I Super
12-
400132-44
32cc DIRECT 48”
D
PowerPro P1528
22-
400128-96
28cc DIRECT 44”
D
PowerPro P1732C
22-
400132-86
32cc CLUTCH 44”
D
Roadrunner III
12- / 22- 400128-11
28cc DIRECT 44”
J
Roadrunner III
12- / 22- 400128-18
28cc CLUTCH 44”
J
Roadrunner III
12-
400128-25
28cc DIRECT 44”
J
Roadrunner III
12-
400128-59
28cc DIRECT 44”
D
Roadrunner III
12- / 22- 400128-61
28cc DIRECT 48”
J
Roadrunner III
12-
400128-83
28cc CLUTCH 44”
D
Silver Eagle 28
12- / 22- 400128-03
28cc DIRECT 44”
D
Silver Eagle 28C
12- / 22- 400128-06
28cc CLUTCH 48”
J
Silver Eagle 28
12- / 22- 400128-17
28cc DIRECT 44”
D
Silver Eagle 28C
12- / 22- 400128-20
28cc CLUTCH 48”
J
Silver Eagle 28
12-
400128-49
28cc DIRECT 44”
D
Silver Eagle 28C
12-
400128-50
28cc DIRECT 48”
J
Silver Eagle 28C
12-
400128-74
28cc CLUTCH 48”
J
Silver Eagle 28
12-
400128-75
28cc DIRECT 44”
D
FR 15” DD 44”
90-
002815-00
28cc DIRECT 44”
D
FR 15” DD 44”
90-
002816-00
28cc DIRECT 44”
D
FR 17” CD 48”
90-
002817-00
28cc CLUTCH 48”
D
FR 17” CD 48”
90-
002818-00
28cc CLUTCH 48”
D
P.O. Box 31567
Tucson, Arizona 85751-1567 • U.S.A.
McCulloch 2003 • Printed in U.S.A.
PN 211703-03
28cc and 32cc
GAS POWERED CURVED SHAFT
STRING TRIMMERS
MARCH 2003
ILLUSTRATED PARTS LIST
P.O. Box 31567 • Tucson Arizona 85751-1567 • U.S.A.
• MANUFACTURING • SALES • SERVICE •
FOR WARRANTY OR SERVICE,
CONTACT THE NEAREST McCULLOCH AUTHORIZED SERVICE CENTER
LISTED UNDER ‘SAWS’ IN YOUR TELEPHONE DIRECTORY YELLOW PAGES.
IF FURTHER ASSISTANCE IS REQUIRED CALL THIS TOLL-FREE HOT LINE.
PLEASE REFERENCE YOUR MODEL AND SERIAL NUMBER.
1-800-521-8559
MONDAY - FRIDAY - 6:00 AM - 4:30 PM (MST)
www.mccullochpower.com
TORQUE SPECIFICATIONS
FASTENER
FIG/
TORQUE
DESCRIPTION
PART NO.
ITEM (IN/LBS) LOCTITE
C’Case to Cylinder
111065
1 / 57
55 - 60
242
C’Case to Plast Plug
111065
1 / 70
35 - 40
242
Insulator to Cylinder
111053
1 / 20
45 - 50
242
Shroud to C’Case
111067
1 / 48
55 - 60
242
Ignition Asy
111053
1 / 40
45 - 50
242
Carburetor
111058
1 / 13
25 - 30
--
Spark Plug
92879
1 / 66 110 - 120
--
Flywheel Nut
111085
1 / 37 140 - 145
242
Flywheel Nut
Mcculloch Mac 1385l Manual 1
322847
1 / 38 140 - 145
242
Starter Housing
111054
2 / 32
30 - 35
--
Clutch Housing
224919
2 / 28
30 - 35
--
ENGINE SPECIFICATIONS
Engine Type . . . . . . . . . . . . . . . . .Air-Cooled, Two Cycle, Single
Chrome Cylinder
Displacement . . . . . . . . . . . . . . . .28cc or 32cc
Idle RPM, Direct Dr . . . . . . . . . . .3000 - 3500 RPM
Idle RPM, Clutch Dr . . . . . . . . . . .2700 - 3000 RPM
Maximum RPM . . . . . . . . . . . . . .7000 - 8000 RPM
Compression, PSI . . . . . . . . . . . .28cc = 80
Mcculloch Mac 140 Manual
(after 10 pulls, thr’tl full open) . . .32cc = 90
Ignition . . . . . . . . . . . . . . . . . . . .Electronic
Flywheel to Ignition Gap . . . . . . . .0.007-0.012 in.
Spark Plug . . . . . . . . . . . . . . . . . .Champion RDJ8J
Spark Plug Gap . . . . . . . . . . . . . .0.025 in. (0.63mm)
Fuel Tank Capacity . . . . . . . . . . . .24 oz. (71ml)
Fuel Type . . . . . . . . . . . . . . . . . . .Unleaded - Regular Grade
Fuel to Oil Ratio . . . . . . . . . . . . . .40:1 McCulloch Custom Lubricant
Dry Weight . . . . . . . . . . . . . . . . . .44” = 9.9 lbs
48” = 13.6 lbs
Carburetor . . . . . . . . . . . . . . . . . .Diaphragm with Primer
Starter Cord . . . . . . . . . . . . . . . . .Nylon, Type 3.5, Length 46 in.