McCulloch MS1436NAV User manual

Service Manual
MTD Products LLC - Product Training and Education Department
FORM NUMBER 769-01424
9/2004
MCCULLOCH CHAIN SAW - MS1436NAV
NOTE: These materials are for use by trained technicians experienced in the service and repair of outdoor power equipment of the
kind described in this publication, and are not intended for use by untrained or inexperienced individuals. These materials are
intended to provide supplemental information to assist the trained technician. Untrained or inexperienced individuals should seek
the assistance of an experienced and trained professional. Read, understand, and follow all instructions and use common sense
when working on power equipment. This includes the contents of the product’s Operators Manual, supplied with the equipment. No
liability can be accepted for any inaccuracies or omission in this publication, although care has been taken to make it as complete
and accurate as possible at the time of publication. However, due to the variety of outdoor power equipment and continuing
product changes that occur over time, updates will be made to these instructions from time to time. Therefore, it may be
necessary to obtain the latest materials before servicing or repairing a product. The company reserves the right to make changes
at any time to this publication without prior notice and without incurring an obligation to make such changes to previously published
versions. Instructions, photographs and illustrations used in this publication are for reference use only and may not depict actual
model and component parts. © Copyright 2005 MTD Products Inc. All Rights Reserved.

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TABLE OF CONTENTS
Air Filter ....................................................................................................................................................................1
Fuel Filter ..................................................................................................................................................................2
Spark Arrester Screen .............................................................................................................................................2
Spark Plug ................................................................................................................................................................3
Removal of Brake Assembly .....................................................................................................................................3
Removing the Chain and Bar ....................................................................................................................................4
Removal of Clutch and Drum Assembly ...................................................................................................................4
Removal of the Chain Oiler ....................................................................................................................................... 5
Starter Servicing ........................................................................................................................................................7
Air Gap ......................................................................................................................................................................9
Flywheel Removal .....................................................................................................................................................9
Carburetor Removal ................................................................................................................................................10
Carburetor Adjustment ...........................................................................................................................................12
Chain Tension Adjustment ......................................................................................................................................13

1
MCCULLOCH CHAIN SAW -
MS1436NAV
MCCULLOCH GASOLINE CHAIN SAWS
The MS are McCulloch brand. They are all 42cc
engines even though we rate them as less in most
cases. The only difference between the models is the
NAV are Non Anti-Vibration and AV is Anti-Vibration.
Model: MS1436 NAV - 14” Bar and 36CC Engine
This product has been tested at a computed kickback
angle (CKA) and conforms to ANSI B175.1-2000,
Annex C.
This Service Manual is a supplement to the User Man-
ual. Read, understand and follow all safety procedures
before operating or servicing this chain saw. Refer to
the Owners Manual for procedures for proper setup
and operation.
Additional information can be found in the 2004 MTD
Update Manual: Form number # 769-00960.
IMPORTANT: Prior to servicing the chain saw,
remove the spark plug wire from the spark plug.
WARNING: Never perform maintenance when
the engine is hot, to avoid any chance of burning
hands or fingers.
1. AIR FILTER
CAUTION: Never operate saw without the air fil-
ter. Dust and dirt will be drawn into engine and
damage it. Keep the air filter clean!
1.1. Using a T-25 Torx driver, loosen the shroud
retaining screws and lift of the top cover. See
Figure 1.
1.2. Lift the air filter out of air-box. See Figure 2.
1.3. Clean air filter. Wash filter in clean, warm, soapy
water. Rinse in clear, cool water. Air dry com-
pletely.
Figure 1
Screws
Figure 2
McCulloch Chain Saw
MS1436NAV

2
1.4. Remove the wire screen from the air box. See
Figure 3.
1.5. Wash screen in clean, warm, soapy water. Rinse
in clear, cool water. Air dry completely.
NOTE: It is advisable to have a supply of spare
filters and screens on hand.
1.6. Install air filter in reverse order of disassembly.
Install engine/air filter cover. Make sure cover fits
properly. Tighten the cover retaining screws
securely.
2. FUEL FILTER
CAUTION: Never operate your saw without a
fuel filter. The fuel filter should be replaced after
each 20 hours of use.
2.1. Drain fuel tank completely before changing filter.
2.2. Remove the fuel tank cap.
2.3. Bend a piece of soft wire into a hook shape.
2.4. Reach into fuel tank opening and hook fuel line.
Carefully pull the fuel line toward the opening
until you can reach it with your fingers.
NOTE: Do not pull the hose completely out of
tank.
2.5. Lift filter out of tank. See Figure 4.
2.6. Pull filter off with a twisting motion. Discard filter.
2.7. Install new filter. Insert end of filter into tank
opening. Make sure filter sits in bottom corner of
tank. Use a long handle screwdriver to aid in fil-
ter placement if necessary.
3. SPARK ARRESTER SCREEN
NOTE: A clogged spark arrester screen will dra-
matically reduce engine performance.
3.1. Using a 10mm socket, remove the 3 bolts secur-
ing the muffler to the cylinder. Remove the muf-
fler. See Figure 5.
Figure 3
Figure 4
Fuel Filter
Figure 5
Bolts

3
3.2. Using a medium Phillips screwdriver, remove the
2 screws that hold the spark arrester cover to the
muffler. See Figure 6.
3.3. Discard the used spark arrester screen and
replace it with a new one.
3.4. Reasemble the muffler components and install
the muffler to the cylinder. Tighten securely.
4. SPARK PLUG
NOTE: NOTE: For efficient operation of the saw
engine, spark plug must be kept clean and prop-
erly gapped.
4.1. Push STOP switch down.
4.2. Remove the shroud. See AIR FILTER Section.
4.3. Disconnect the wire connector from the spark
plug by pulling and twisting at the same time
Figure 6
4.4. Using the scrench, remove the spark plug. See
Figure 7.
4.5. Check electrode gap with wire feeler gauge and
set gap to .025" (.635mm) if necessary.
4.6. Reinstall a new spark plug.
NOTE: A resistor spark plug must be used for
replacement (McCulloch part no. 9295-310502).
NOTE: This spark ignition system meets all
requirements of the Canadian Interference-
Causing Equipment Regulations.
5. REMOVAL OF BRAKE ASSEMBLY
5.1. Disconnect the spark plug wire from the engine.
5.2. Using a 5/8” socket, remove the nut attaching
the cover to the unit. See Figure 8.
Figure 7
Scrench
Figure 8
Hex Nut
Torx Scr e w

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5.3. Using a T-25 Torx wrench, remove the screw
securing the cover to the unit. See Figure 8.
5.4. Remove the cover.
6. REMOVING THE CHAIN AND BAR
6.1. Remove the brake assembly cover. See
REMOVAL OF BRAKE ASSEMBLY Section.
6.2. Remove the chain from the bar. See Figure 9.
6.3. Lift the bar from the mounting stud and guide.
6.4. During assembly make certain that the tab from
the tensioning screw fits into the hole in the
chain bar. See Figure 10. See Figure 11.
7. REMOVAL OF CLUTCH AND DRUM ASSEM-
BLY
7.1. Remove the spark plug from the unit.
7.2. Remove the brake assembly kit cover.
7.3. Remove the chain and bar.
7.4. Place a piece of starter cord into the spark plug
opening. This will aid in removing of the nut
securing the clutch and drum assembly to the
crankshaft. See Figure 12.
Figure 9
Figure 10
Tensioning Screw Tab
Figure 11
Hole for Tab
Figure 12
Starter Cord

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7.5. Using a 13mm socket, remove the nut securing
the clutch and drum assembly to the crankshaft.
See Figure 13.
NOTE: This is a left hand threaded nut. Remove
in a clockwise fashion.
7.6. Remove the assembly from the crankshaft. See
Figure 14.
Figure 13
Hex Nut
Figure 14
Drum Assembly
Clutch Assembly
Anti-Dust Cap
Hex Nut
7.7. Inspect and repair as needed.
NOTE: During assembly, the machined groove
in the drum/sprocket assembly must engage the
tabs on the nylon worm gear. See Figure 15.
8. REMOVAL OF THE CHAIN OILER
8.1. Remove the brake kit assembly.
8.2. Remove the chain and bar.
8.3. Remove the clutch and drum assembly.
8.4. Using a number 2 phillips screwdriver. Remove
the two screws securing the anti-dust cap to the
chain oiler. See Figure 16.
Figure 15
Tabs Machined Groove
Figure 16
Screws

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8.5. Using needle nose pliers, remove the worm
gear. See Figure 17.
8.6. Using the tip of a small screwdriver, lift the rear
portion of the pump shaft from the housing. See
Figure 18.
8.7. Remove the shaft from the oil pipe. Inspect the
shaft for damage. See Figure 19.
8.8. Using a small screwdriver, remove the ends of
the two hoses from the housing. Inspect for
damage. See Figure 20.
Figure 17
Worm Gears
Figure 18
Pump Shaft Assembly
Figure 19
Figure 20
Hose Connector