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MTD 4P90HUC User Manual
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MTD 4P90HUC Vertical Shaft Engines
User Manual - Page 2
For 4P90HUC. Series: P90 Series
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Chapter 1: Introduction
Professional Service Manual Intent
Safety
Fasteners
Assembly Instructions
Model And Serial Number
Maintenance
Spark Plugs
Air Filter
Oil Type And Capacity
Changing The Oil
Oil Filter
Oil Pre Screen
Fuel System
Servicing The Fuel System
Fuel Filter
Valve Lash
Exhaust System
Cleaning The Engine
General Torque Specifications
Chapter 2: Basic Troubleshooting
Definitions
Introduction
Steps To Troubleshooting
Define The Problem
Identify Factors That Could Cause The Problem
Repairing The Problem
Prime Test
Leakdown Test
Compression Test
PCV Testing
Chapter 3: Air Intake System
Air Filter
Blower/air Filter Housing
Carburetor And Insulator
Chapter 4: The Fuel System And Governor
Inspecting The Fuel
Test Fuel For Alcohol
Choke/throttle Cable Adjustment
Carburetors
Inspecting The Carburetor
Disassembly And Rebuilding The Carburetor
Engine Speed Adjustment
Afterfire Solenoid
Testing The Afterfire Solenoid
Governor
Governor Arm
Governor Shaft
Governor Cup And The Governor Gear
Chapter 5: Lubrication
Oil Type And Quantity
Oil Dipstick
Dip Stick Tube Removal
Lubrication System
Testing The Oil Pump
Positive Crankcase Ventilation Valve
Chapter 6: Starter And Charging Systems
Starter Removal
Bench Testing The Electric Starter
Rebuilding The Starter
Charging System
Charging System Testing
Stator
Rotor
Chapter 7: Ignition System
Troubleshooting The Ignition System
The Module
Module Removal
Installing The Module And Setting The Air Gap
Flywheel
Spark Plug
Cleaning The Spark Plug
Inspection Of The Spark Plug
Spark Plug Removal
Chapter 8: Exhaust
Spark Arrestor (if Equipped)
Muffler Removal/replacement
Catalytic Converter
Chapter 9: Cylinder Head
Cylinder Head Removal
Cylinder Head Installation
Valves
Push Rod Guide Plate
Chapter 10: Crankshaft, Piston And Connecting Rod
Crankshaft Inspection
Piston Inspection
Connecting Rod Inspection
Cylinder Inspection
Balance Shaft
Reassembly
Engine Specifications Chart
Engine Torque Values Chart
Chapter 11: Failure Analysis
Abrasive Ingestion
Insufficient Lubrication
Engine Overspeed
Overheated
Mechanical Breakage/ Wear
Detonation/preignition
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Contents
Table of Contents
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File type: PDF
File name: 38439477_4p90huc.pdf
File size: 1.64 MB
File Language: English
Pages: 120
Author: MTD
File created: 2016-04-26
Published:
2023-05-01
Updated: 2024-04-26
Verified by
Ramona Nikolaus
on 2024-04-26
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Table of Contents
×
Chapter 1: Introduction
7
Professional Service Manual Intent
7
Safety
7
Fasteners
9
Assembly Instructions
9
Model And Serial Number
11
Maintenance
11
Spark Plugs
12
Air Filter
13
Oil Type And Capacity
14
Changing The Oil
15
Oil Filter
16
Oil Pre Screen
16
Fuel System
17
Servicing The Fuel System
17
Fuel Filter
17
Valve Lash
18
Exhaust System
20
Cleaning The Engine
20
General Torque Specifications
20
Chapter 2: Basic Troubleshooting
21
Definitions
21
Introduction
21
Steps To Troubleshooting
21
Define The Problem
21
Identify Factors That Could Cause The Problem
23
Repairing The Problem
27
Prime Test
28
Leakdown Test
28
Compression Test
30
PCV Testing
31
Chapter 3: Air Intake System
33
Air Filter
33
Blower/air Filter Housing
35
Carburetor And Insulator
36
Chapter 4: The Fuel System And Governor
39
Inspecting The Fuel
39
Test Fuel For Alcohol
40
Choke/throttle Cable Adjustment
41
Carburetors
42
Inspecting The Carburetor
42
Disassembly And Rebuilding The Carburetor
43
Engine Speed Adjustment
47
Afterfire Solenoid
48
Testing The Afterfire Solenoid
50
Governor
52
Governor Arm
52
Governor Shaft
54
Governor Cup And The Governor Gear
54
Chapter 5: Lubrication
55
Oil Type And Quantity
55
Oil Dipstick
56
Dip Stick Tube Removal
56
Lubrication System
57
Testing The Oil Pump
57
Positive Crankcase Ventilation Valve
59
Chapter 6: Starter And Charging Systems
61
Starter Removal
61
Bench Testing The Electric Starter
62
Rebuilding The Starter
63
Charging System
74
Charging System Testing
75
Stator
77
Rotor
78
Chapter 7: Ignition System
79
Troubleshooting The Ignition System
79
The Module
80
Module Removal
81
Installing The Module And Setting The Air Gap
82
Flywheel
83
Spark Plug
84
Cleaning The Spark Plug
84
Inspection Of The Spark Plug
84
Spark Plug Removal
84
Chapter 8: Exhaust
85
Spark Arrestor (if Equipped)
85
Muffler Removal/replacement
86
Catalytic Converter
88
Chapter 9: Cylinder Head
89
Cylinder Head Removal
89
Cylinder Head Installation
92
Valves
93
Push Rod Guide Plate
96
Chapter 10: Crankshaft, Piston And Connecting Rod
100
Crankshaft Inspection
100
Piston Inspection
101
Connecting Rod Inspection
103
Cylinder Inspection
103
Balance Shaft
104
Reassembly
105
Engine Specifications Chart
107
Engine Torque Values Chart
109
Chapter 11: Failure Analysis
111
Abrasive Ingestion
111
Insufficient Lubrication
114
Engine Overspeed
116
Overheated
117
Mechanical Breakage/ Wear
118
Detonation/preignition
118
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