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

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

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

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

3.2. 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

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

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

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

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