War Department Semi-Trailer Flat Bed, 20-ton Fruehauf CPT 20 Technical Manual 5-9034 – PDF DOWNLOAD
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War Department Semi-Trailer Flat Bed, 20-ton Fruehauf CPT 20 Technical Manual 5-9034 – PDF DOWNLOAD
Introduction:
1. PURPOSE AND SCOPE.— These instructions are published for the infor mation and guidance of the using arms charged with the operation, maintenance, and repair of this materiel. They contain descriptions of the major units and their function in relation to the other compo nents of the trailer, as well as instructions for operation, inspection, and mainte nance.
1. GENERAL DESCRIPTION.— This 20-ton, low bed, platform
trailer is so designed that it may be pulled behind any heavy duty
towing vehicle which is provided with a suitable pintle hook. Con
verter gear can be disconnected from trailer, thus converting trailer
into a semi-trailer which can be pulled behind a tractor equipped with
a 5th wheel.
a. Identification. —-(1) Distinguishing features of this vehicle are
its low drop frame, and low bed type platform. Frame is an all-welded
unit of pressed, formed hi-tensile, and structural steel. Trailer is
mounted on eight dual wheels at rear and two at front.
(2) Designation. —Trailer and converter gear serial and name plate
are located on the main side rail on right side toward the front.
6. Mobility.—This trailer is designed for highway travel. Its abil
ity to travel cross-country depends on the tractive ability of the towing
vehicle. Maximum speed as a semi-trailer is 30 M.P.H.; as a full
trailer, 20 M.P.H.
TABLE OF CONTENTS:
War Department Semi-Trailer Flat Bed, 20-ton Fruehauf CPT 20 Technical Manual 5-9034 – PDF DOWNLOAD
I INTRODUCTION >T **T
1 Purpose and Scope 2
II DESCRIPTION AND CHARACTERISTICS
1 General Description 3
2 Axles —Front 3
3 Axles— Rear 3
4 Brakes— Front 3
5 Brakes— Rear 3
6 Drawbar 4
7 Electrical System
8 Springs —Front
9 Supports —Front (Converter Gear)
10 Supports —Rear (Trailer) >
11 Wheels— Front
12 Wheels— Rear
13 Tires—Front
14 Tires—Rear
III OPERATING INSTRUCTIONS AND CONTROLS
1 Controls
Coupling Converter Gear to Semi-Trailer
Coupling Tractor to Trailer
Uncoupling Converter Gear from Semi-Trailer
Uncoupling Tractor from Semi-Trailer 10
Driving Truck and Trailer 10
Braking Truck and Trailer 11
IV INSPECTION — LUBRICATION — ADJUSTMENT
Daily Inspections When in Operation 12
Lubrication 13
Mechanical Inspection and Adjustment 13
TOOLS AND EQUIPMENT
Introduction
Tools 16
Equipment 17
PART II — MAINTENANCE MANUAL
SAFETY INSTRUCTIONS
Safety Instructions 19
II AXLE — FRONT
1 Axle Alignment
20 2 Disassembly to Check Axle Camber or Bent Axle 20
Checking for Bend 20
Checking for Camber 21
Axle Replacement 21
Drilling Dowel Pin Holes in Replacement Axles 23
Axle—Front —Service Diagnosis and Remedy 23
III AXLES — REAR
General 21
M5745CC
I N D E X—(Continued)
Section Paragraph Page Nos.
IV BRAKES
1 Minor Brake Adjustment 29
2 Brake Relining 29
3 Brake Shoe 31
4 Cams—Front and Rear 31
5 Servicing Slack Adjuster 34
6 Brake Drum Replacement 35
7 Major Brake Adjustment 36
8 Hand Parking Brake Replacement 36
9 Adjusting Hand Parking Brake 36
10 Cross Shaft 38
11 Brake Chambers 39
12 Brake Chamber Diaphragm 40
13 Brake Cylinders 41
14 Relay —Emergency Valve 44
15 Tubing – 50
16 Hose Coupling 51
17 Air Filter 51
18 Quick Release Valve 52
19 Brakes —Service Diagnosis and Remedy 53
V COUPLER
1 General 55
2 Removal 55
•3 Replacement 55
4 Testing and Correcting Play in Hook 55
5 Coupler —Service Diagnosis and Remedy 57
VI DRAWBAR
1 ‘ Rebushing Drawbar 58
2 Replacing Eye ‘.
3 Replacing and Repairing Safety Chains 59
4 Installing Drawbar Frame Brackets 59
5 Riveting and Installing Hinge Brackets 59
6 • Drawbar —Service Diagnosis and Remedy 59
VII ELECTRICAL SYSTEM — LIGHTS
1 Wiring ‘. 60
2 Lights 60
3 Clearance Lamps 62
4 Locating Trouble 63
5 Lights —Service Diagnosis and Remedy 63
VIII FRAME AND PLATFORM
1 General 64
2 Straightening Bent Frame Members 64
3 Replacing Frame Members 64
4 Repairing Section of a Member 64
5 Spring Hangers 64
IX PINTLE HOOK
1 Removal 67
2 Disassembly 67
3 Replacement and Reassembly of a Pintle Hook 67
4 Pintle Hook Spring and Sleeve Removal 68
5 Pintle Hook Spring and Sleeve Replacement 68
I N D E X— (Continued)
Section Paragraph Page Nos.
X RADIUS RODS
1 Removal 69
2 Replacement 69
XI SPRINGS
1 Removing Main Spring 71
2 Installing Main Spring 71
3 Removing Auxiliary Spring 71
4 Spring Repair 72
5 Replacing Both Springs 72
6 Rebushing Springs and Hangers 72
7 Maintenance 73
8 Springs —Service Diagnosis and Remedy 73
XII SUPPORTS — CONVERTER GEAR
1 General 75
2 Removing Support Legs 75
3 Removing Support Wheel and Axle 75
4 Replacing Adjusting Bar 75
5 Removing Operating Parts from the I-beam 77
6 Reassembly 77
XIII SUPPORTS — SEMI-TRAILER
1 General 79
2 Removal of Jacks 79
3 Oil 79
4 Support Leg Assembly 84
5 Operating Assembly 84
XIV WHEELS, HUBS, BEARINGS, AND TIRES
1 Introduction 86
2 Hub Assembly— Front Axle 86
3 Outer Wheel Assembly— Rear Axle f 88
4 Inner Wheel Assembly — Rear Axle 89
5 Bearing Cups 90
6 Wheel Studs— Broken or Worn 91
7 Tire Repairs 91
8 Wheels, Hubs, Bearings, Tires—Service Diagnosis and
Remedy 92
PART Dt — SPARE PARTS LIST
Section Pnge Nos.
I AXLE 93
Converter Gear Axle and Wheel Paris 93
Trailer Axle (See Underronstruction)
II BRAKES 94-110
Brake Chamber —Converter Gear 94
Brake Cylinder—Trailer 95
Hand Parking Brake 97-99
Internal Brakes — Converter Gear 101
Internal Brakes —Trailer 10I5
Operating Parts for Brakes —Converter Gear 105
Operating Parts for Brakes —Trailer 107
Relay Emergency Valve 108-109
Strainer for Brake Lines 110
I N D E X— (Continued}
Section Page Nos.
III COUPLER OR FIFTH WHEEL 113
IV DRAWBAR 115
V ELECTRICAL 117-124
Coupling Socket 117
Lights ‘. 118-119
Wiring and Lights — Converter Gear 121
Wiring and Lights— Trailer 123-124
VI FRAME 125
VII HOOK CONNECTION 126
VIII SUPPORT 129-137
Converter Gear Support 129-131
Jack for Trailer Support 133
Trailer Support Leg 135
Trailer Support Operating Mechanism 137
IX TOOL KIT AND ACCESSORIES 139
X UNDERCONSTRUCTION 141-143
Converter Gear Underconstruction 141
Trailer Underconstruction 143
XI WHEELS, HUBS AND DRUMS 145-147
Converter Gear Wheels, Hubs and Drums 145
Trailer Wheels, Hubs and Drums 147
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