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MTD 75 series User Manual
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61/65/70/75 Series Horiz
ontal Shaft Engines
70
3.
Install a st
arter cup by placing it on the flywheel,
with the dimple on the b
o
ttom of the st
arter cup in
the dimple in
the flywheel. See Figu
re 6.3.
4.
Install th
e flywheel nut and tighten it to
a torque of
47 - 52 ft-lbs (6
4 - 70 Nm).
Figure 6.3
Flywheel dimple
S
tarter cup dimple
75
77
Table of Contents
Default Chapter
3
Table of Contents
3
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
16
Fuel System
17
Servicing the Fuel System
17
Fuel Filter
17
Valve Lash
19
Exhaust System
22
Cleaning the Engine
22
General Torque Specifications
22
Chapter 2: Basic Troubleshooting
23
Definitions
23
Introduction
23
Steps to Troubleshooting
23
Define the Problem
23
Identify Factors that Could Cause the Problem
25
Repairing the Problem
29
Prime Test
30
Leak-Down Test
30
Compression Test
32
PCV Testing
33
Troubleshooting Flow Charts
34
Engine Operation Problems
35
Chapter 3: Air Intake Systems
39
Snow Engines
39
Heat Box
39
Chore Engines
42
Air Filters
42
Air Filter Base and Intake Elbow
43
Carburetor Insulator
44
Chapter 4: The Fuel System and Governor
47
Fuel Line
47
Inspect the Fuel Lines
47
Inspecting the Fuel
48
Test Fuel for Alcohol
48
Fuel Filter
49
Fuel Tank Vent
50
To Test the Cap Vent
50
The Fuel Tank
51
Choke
53
Choke Linkage
54
Primers
55
Evaporative (EVAP) Emissions System
56
Troubleshooting the EVAP System
57
Roll over Valve Vent
58
Charcoal Canister
59
Testing a Charcoal Canister
60
Carburetors
61
Inspecting the Carburetor
61
Disassembly and Rebuilding the Carburetor
61
Governor
65
Governor Arm
65
Governor Shaft
66
Governor Cup and the Governor Gear
67
Chapter 5: Lubrication
69
Oil Type and Quantity
69
Oil Dip Stick
70
Dip Stick Tube Removal
71
Lubrication System
72
Positive Crankcase Ventilation Valve
73
Chapter 6: Starter and Charging Systems
75
Recoil Starter Removal
75
Starter Cup
75
Starter Rope
77
Starter Pulley and Recoil Spring
78
Electric Starter
80
Electric Starter Switch
81
Charging System
85
Stator
86
Rotor
86
Chapter 7: Ignition System
87
Troubleshooting the Ignition System
87
Stop Switch
88
Remote (Ignition) Stop Switch
89
The Module
91
Module Removal
92
Installing the Module and Setting the Air Gap
92
Flywheel
93
The Spark Plug
94
Cleaning the Spark Plug
94
Inspection of the Spark Plug
94
Spark Plug Removal
94
Chapter 8: Exhaust
95
Summer Engines
95
Spark Arrestor
95
To Remove/Replace the Muffler
96
Snow Engines
97
Chapter 9: Cylinder Head
99
Valves
103
Push Rod Bushings
106
Chapter 10: Crankshaft, Piston and Connecting Rod
109
Crank Shaft Inspection
112
Piston Inspection
113
Connecting Rod Inspection
114
Cylinder Inspection
115
Bearings
116
Reassembly
117
Engine Specifications Chart
120
Engine Torque Values Chart
124
Chapter 11: Failure Analysis
125
Abrasive Ingestion
125
Insufficient Lubrication
128
Engine Overspeed
129
Overheated
130
Mechanical Breakage/ Wear
131
Detonation/Preignition
131
4
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MTD 75 series Specifications
General
Brand
MTD
Model
75 series
Category
Engine
Language
English
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