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Onan
Portable Generator
NHE
Onan NHE Service Manual
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J
Cummins
Power
Generation
1400
73rd
Avenue
N.E.
Minneapolis,
MN
55432
763-574-5000
Fax:
763-574-8087
Cummins
and
Onan
are
registered
trademarks
af
Cumrnins
Inc.
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
103
Table of Contents
Safety Precautions
2
General Safety Precautions
2
Supplement
3
Electric Starter
3
Disassembly
3
Driving Roll Pin out
3
Testing Armature for Grounds
4
Testing for Opens
4
Brush Inspection
4
Testing for Shorts
4
Assembly
5
Resting Brush Spring on Brush Side
6
Starter Assembly
7
If Return Spring Is Unassembled
7
Nikki Carburetor
10
Mixture Screw Adjustments
10
Float Setting
10
Table of Contents
11
Introduction
13
Model Identification
13
About this Manual
13
Specifications
15
Dimensions and Clearances
17
Section 4 -Torque Specifications
21
Preparing to Service
23
Troubleshooting
23
Special Tools
23
Safety Considerations
23
Generator Set Removal
24
LP-Gas Purging Procedure
24
Hazards and Their Source
24
Disconnecting Set from RV Systems
25
Removing Conventional Compartment Mounted Set from RV
25
Removing Underfloor Mounted Set from RV
26
Partial Set Removal
26
Typical Under-Floor Installation
26
Complete Set Removal
27
Engine Primary Systems
29
Troubleshooting Engine Primary Systems
29
Introduction
29
Exhaust System
32
Compartment Mount Exhaust System
32
Underfloor Mount Exhaust System
33
Tallpipe Recommendations
34
Exhaust System Underfloor Mount
34
Cooling System
35
Ignition System
36
Breaker Points and Condenser
36
Breaker Point Replacement and Adjustment
36
Breaker Points
37
Ignition Coil Testing
37
Direct Testing with Ohmmeter
37
Ignition Coil
37
Crankcase Ventilation System
38
Spark Plugs
38
Wiring
38
Checking Plug Gap
38
Governor Adjustments
39
Crankcase Breather Service
39
Crankcase Breather
39
Governor
39
Voltage and Speed Charts
40
Fuel System - Gasoline
40
Air Filter Assembly
40
Carburetor and Intake Manifold Assembly
40
Carburetor Mixture Screw Adjustments
41
Gasoline
42
Carburetor Adjustment Specifications
43
Carburetor Overhaul
43
Clean and Repair
43
Mixture Needle Inspection
44
Float Level
44
Choke
44
Float Installation
44
Choke Assembly
45
Choke Adjustments
45
Bi-Metal Spiral Strip
45
Choke Replacement
46
Choke Pulloff Diaphragm Adjustments
46
Fuel Pump
46
Choke Pull-Off Diaphragm
46
Plunger Assembly
47
Fuel Pump Assembly
47
Fuel System - LP-Gas
47
Carburetor, Air Filter, and Intake Manifold Assembly
48
LP Gas
50
Regulator
51
LP Gas Regulator
51
Regulator Assembly
51
Regulator Test
52
Fuel Filter
52
Solenoid Valve
53
NHE Control Description
55
Printed Circuit Board Assembly
55
Introduction
55
Start/Run/Stop Switch
56
Start Solenoid
56
Battery Charge Resistor
56
NHE Control Operation
56
Starter Lock out Run
57
NHE Control Panel Assembly
57
NHE Control Troubleshooting
58
NHEL Control Description
62
Stop Relay
62
Blocking Diode
62
NHEL Control Operation
63
NHEL Control Troubleshooting
65
Generator Description
69
Generator Operation
69
Field Current Rectifier
69
Introduction
69
Generator Troubleshooting
71
Voltage Regulating Transformer
71
Typical Schematic
72
Typical Wiring Diagram
73
Troubleshooting the Generator
74
Generator Service
76
Generator Disassembly
76
Brush Block
76
Stator Assembly Removal
77
Rotor Tool
77
Braided Insulation
78
Brushes and Slip Rings
79
Brush Replacement
79
Slip Ring Service
80
Transformer Voltage Adjustments
81
Generator Testing
81
Rotor Test
81
Field Voltage Test
81
Resistance Values for Rotors
82
Stator/Transformer Test
82
CR4 Bridge Rectifier Test
83
Open or Shorted Windings
83
Engine Block Assembly
85
Cylinder Heads
85
Oil Filter and Adapter
85
General
85
Valve System
86
Valve Face
86
Valve Spring Compressor
86
Spring
87
Stems and Guides
87
Valve Stem Seal
87
Reconditioning Valves and Valve Seats
87
Valve Guide Replacement
88
Valve Seats
88
Tappet Adjustment
89
Valve Clearance Adjustment
89
Inserting New Valve Seat
89
Gear Cover
90
Governor Cup
90
Timing Gears and Camshaft
91
Lubrication System
91
Oil Pump
91
Oil Pump Assembly
91
Piston Assembly
92
Removing Wear Ridge
92
Oil By-Pass Valve
92
Removing Piston Rings
93
Cleaning Ring Grooves
93
Checking Ring Land
93
Connecting Rod Inspection
94
Piston Pin Inspection
94
Bearing Inspection
94
Piston Clerance
94
Piston Assembly Installation
95
Rod Bearing Clearance
95
Rod Cap Alignment
95
Installing Piston
95
Crankshaft
96
Checking Endplay
96
Cylinder Block
96
Cylinder Bore Inspection
97
Methods of Measure
97
Cylinder Bore Diameter
97
Reboring the Cylinder
98
Deglazing Cylinder Bores
98
Honing Cylinders
98
Bearings
99
Camshaft Bearings
99
Front Bearing
99
Crankshaft Bearings
99
Oil Seals
100
Service Checklist
101
Mounting
101
Lubrication
101
Initial Start Adjustments
101
Fuel System
102
Mechanical
102
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Onan NHE Specifications
General
Brand
Onan
Model
NHE
Category
Portable Generator
Language
English
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