Cub Cadet CC 4BP 32cc User Manual

Professional Shop Manual

32 cc Back Pack Blower

NOTE: These materials are for use by trained technicians who are 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 provid e su pp lem ental information to assist the trained technician. Untrained or inexperienced individuals should seek the assistance of an experienced and tr ained professional. Read, understand, a nd 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 a nd accura te as possib le at the time of publica tion. 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.

MTD Products Inc - Product Training and Education Department

FORM NUMBER - 769-03584

10/2007

Table of Contents

Chapter 1: Introduction......................................................................................................... 1

Introduction .........................................................................................................................1

Fasteners .............................................................................................................................1

Assembly ............................................................................................................................1

Model and serial numbers................................................................................................... 2

Chapter 2: Maintenance......................................................................................................... 3

Maintenance ........................................................................................................................3

Spark plugs ......................................................................................................................... 3

Air filter .............................................................................................................................. 5

Spark arrestor...................................................................................................................... 6

Fuel filter .............................................................................................................................6

Valve lash ...........................................................................................................................7

Starter.................................................................................................................................. 8

Chapter 3: Trouble shooting ..................................................................................................9

Initial Trouble Shooting...................................................................................................... 9

To check the fuel in the carburetor: ....................................................................................9

Compression testing.......................................................................................................... 11

Chapter 4: Ignition ................................................................................................................14

Troubleshooting the Ignition System ................................................................................14

The ignition system consists of......................................................................................... 14

Module ..............................................................................................................................16

Flywheel ............................................................................................................................17

Chapter 5: Fuel system and carburetor ..............................................................................19

Troubleshooting the Fuel System ..................................................................................... 19

Repairing the fuel system .................................................................................................20

Fuel lines ...........................................................................................................................21

Troubleshooting/Repairing the Carburetor .......................................................................21

Disassembly of the carburetor .......................................................................................... 22

Chapter 6: Blower housing .................................................................................................. 25

Back pack frame ...............................................................................................................25

Blower housing and impeller ............................................................................................26

CHAPTER 1: INTRODUCTION

INTRODUCTION

Introduction

The 32cc backpack blower is a full crank, 4-cycle blower. It was introduced in the 2008 season under a variety of brand names. This blower has 32cc’s of displacement and produces a maximum of 475 cfm at 150 mph.

Figure 1.1

Disclaimer: This Professional Shop Manual is

intended for use by trained, professional technicians.

• Common sense in operation and safety is assumed.

• In no event shall MTD be liable for poor text interpretation, or poor execution of the procedures described in the text.

• If the person using this manual is uncomfortable with any procedures they encounter, they should seek the help of a qualified technician.

Fasteners

• Most of the fasteners used on the blower are sized in fractional inches. Some are metric. For this reason, wrench sizes are frequently identified in the text, and measurements are given in U.S. and metric scales.

• If a fastener has a locking feature that has worn, replace the fastener or apply a small amount of releasable thread locking compound such as Loctite® 242 (blue).

• Some fasteners like cotter pins are single-use items that are not to be reused. Other fasteners such as lock washers, retaining rings, and internal cotter pins (hairpin clips) may be reused if the do not show signs of wear or damage. This manual leaves that decision to the judgement of the technician.

Assembly Torque specifications may be noted in the part of the

text that covers assembly, they may also be summarized in tables along with special instructions regarding locking or lubrication.

Whichever method is more appropriate will be used. In many cases, both will be used so that the manual is handy as a quick-reference guide as well as a step-bystep procedure guide that does not require the user to hunt for information.

The level of assembly instructions provided will be determined by the complexity of reassembly, and by the potential for unsafe conditions to arise from mistakes made in assembly.

Some instructions may refer to other parts of the manual for subsidiary procedures. This avoids repeating the same procedure two or three times in the manual.

INTRODUCTION

Model and serial numbers

The model (item) and serial number for this blower are on a little white sticker with bar code. These are the numbers needed when ordering parts. This sticker can be found at the bottom of the starter housing by. See Figure 1.2.

Model number Sticker

Fuel tank

Figure 1.2

The model (item) number and serial number are printed with a small type face, above the bar code. See Figure 1.3.

Serial number

NOTE: Engine disassembly and reassembly is not covered in this manual because it is not economical to rebuild the engine.

Model (item) number

Figure 1.3

CHAPTER 2: MAINTENANCE

Maintenance

MAINTENANCE

The specifics in this manual are aimed at the 32cc back pack blower, however the contents can be used for most outdoor power equipment.

As the saying goes “an ounce of prevention is worth a pound of cure” the same can be said about preventive maintenance on outdoor power equipment. By changing the spark plug, air filter, and oil in annual intervals many failures can be avoided. Sometimes just clearing off yard debris that was collected while in use can make the difference between a properly r unning piece of equipment or a failure.

Spark plugs

1. The spark plug used in the 32cc back pack blower is a Champion RDZ19H gapped to .025” (.6 mm). See Figure 2.1.

2. Wear rate will vary somewhat with severity of use. If the edges of the center electrode are rounded-off, or any other apparent wear / damage occurs, replace the spark plug before operating failure (no start) occurs.

3. Cleaning the spark plug: NOTE: It is not recommended to clean spark

plugs. Use of a wire brush may leave metal deposits on the insulator that causes the spark plug to short out and fail to spark. Use of abrasive blast for cleaning may cause damage to ceramic insulator or leave blast media in the recesses of the spark plug. When the media comes loose during engine operation, severe and non-warrantable engine dama ge may result.

4. Inspection of the spark plug can provide indications of the operating condition of the engine.

• Light tan colored deposits on insulator and electrodes is normal.

• Dry, black deposits on the insulator and electrodes indicate an over-rich fuel / air mixture (too much fuel or not enough air)

Figure 2.1

• Wet, black deposits on the insulator and electrodes indicate the presence of oil in the combustion chamber.

• Heat damaged (melted electrodes / cracked insulator / metal transfer deposits) may indicate detonation.

• A spark plug that is wet with fuel indicates that fuel is present in the combustion chamber, but it is not being ignited.

Maintenance

Spark plug removal

1. Remove the engine cover by: 1a. Remove the screws that hold the cover in

place.

NOTE: There are eight screws for the engine cover, four that go into the engine block casting and three that go into the blower housing and one into the fuel tank bracket. Make sure you put the machine threaded screws into the casting and the plastic threaded screws into the blower housing and fuel tank bracket. See Figure 2.2.

Plastic threaded

screw

Machine threaded

screw

2. Disconnect the spark plug wire. See Figure 2.4.

Disconnect the spark plug wire

Figure 2.4

3. Remove the spark plug using a 5/8” spark plug socket. See Figure 2.5.

Figure 2.2

1b. Lift the cover up and away, sliding it out from

in between the engine block and the fuel tank bracket. See Figure 2.3.

Slide cover out from in between

the engine and the fuel tank bracket

Figure 2.3

Remove using a 5/8” spark plug socket

Figure 2.5

4. Gap a new plug at .025” (.6 mm).

5. Install the spark plug and tighten to a torque of 120 in. lbs.(12 -15 Nm).

6. Follow steps 1 and 2 in reverse order.

7. Test run the blower in a safe area before returning to service.

Maintenance

Air filter

A dirty air filter can reduce engine power, increase fuel consumption and make starting more difficult.

The air filter should be cleaned every 10 hours of use.

8. To clean/replace the air filter: 8a. Press down the on tab of the air filter cover

and swing the cover up. See Figure 2.6.

Press tab

Figure 2.6

8b. Remove the foam air filter. See Figure 2.7.

Foam air filter

Figure 2.7

8c. Wash the air filter with warm soapy water.

Let the filter air dry. DO NOT wring the fil- ter out. Wringing the filter can tear it. Squeeze the filter , b ut do not twist it. Put a 1/4 teaspoon (1.25cc) of oil to the filter

and squeeze it through out the filter.. IMPORTANT: Always replace a damaged filter. 8d. Swing the cover back in place. make sure

the tab snaps into place.

Maintenance

Spark arrestor

The spark arrestor should be checked and/or cleaned every 10 hours of use.

NOTE: The spark arrestor also serves to keep blockages out of the exhaust system. Typical blockages include insect nests built during the dormant season.

To check/clean the spark arrestor:

1. Remove the engine cover as describe in the spark plug section of this chapter.

2. Remove the two screws holding the spark arrestor cover in place. See Figure 2.8.

Muffler bolt

Spark arrester

Fuel filter

A dirty fuel filter can result in a lean run condition. The fuel filter should be replaced every 10 hours of use.

NOTE: The weighted fuel filter (clunk) keeps the filter submerged in the fuel at any angle of operation. Running the blower without the filter may allow air to be entrapped in the fuel line creating a lean run condition at higher RPMs. This will cause a catastrophic failure of the engine.

To clean/replace the fuel filter:

1. To service the fuel filter take a piece of wire and bend a hook on one end of it. See Figure 2.9.

Figure 2.8

NOTE: The top screw is a muffler bolt and uses

a T-25 to rx driver to remove it. The botto m screw uses a T-20 torx driver.

3. The screen can now be inspected. If it is blocked with carbon, it may be:

• Replaced with a new spark arrester screen.

• Cleaned by mechanical means

• Solvent cleaned

• Burned clean using a butane or propane torch. NOTE: This is an air cooled engine. In order to

work properly there must be good air flow over the fins of the engine. It is recommend to clean the cylinder fins of any debris while the engine cover is removed.

4. Reassemble the blower following the steps just described in reverse order.

Figure 2.9

2. Remove the gas cap.

3. Stick the hook end of the wire into the fuel tank and fish out the fuel filter. See Figure 2.10.

Fuel filter

Figure 2.10

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