Mustang 3503 User manual

3503
3703
COMPACT EXCAVATORS
3503 Serial Number Range
Engine Tier I Models: AD00001 to AE01552
Engine Tier II Models: AD01553 to AE02832
Engine Tier III Models: AG00593 and up
3703 Serial Number Range
Engine Tier I Models: AD00001 to AE01553
Engine Tier II Models: AD01554 to AE02799
Engine Tier III Models: AG00580 and up
PARTS MANUAL
PART #918049
®
Revision G - 01/09
Mustang Manufacturing Company, Inc.
®

INTRODUCTION
When ordering service parts, specify the correct
part number, full description, quantity required, the
unit model number and serial number. For your
safety and continued proper operation, use only
genuine MUSTANG service parts.
The model and serial number for this unit are on a
tag located on a panel on the front of the cab.
“Right” and “left” are determined from a position
sitting on the operator’s seat and facing forward.
MUSTANG Manufacturing Company reserves the
right to make changes or improvements in the
design or construction of any part of the unit without
incurring the obligation to install such changes on
any previously delivered units.
Refer to the abbreviations table located on this page
for special parts descriptions. Standard attaching
hardware torque values are also provided near the
back of this manual. Metric torque values shown in
the illustrations are in Newton-meters and are
converted to foot-pounds by multiplying by 0.738.
Specific reference numbers, indicating a complete
assembly, are circled in some illustrations. A small
bag, pictured in some illustrations, indicates a seal
kit (seals, o-rings, etc.). In the exploded view parts
list, additional information may follow the
Reference Number.
Serial number breaks are indicated as follows:
• (SN 999 and before) - indicates serial numbers
up to and including 999.
• (SN 1000 - 2000) - indicates serial numbers
between 1000 and 2000.
• (SN 999 and up) - indicates serial numbers
including 999 and after.
Serial number exceptions and inclusion are
indicated as follows:
• (SN 999 and before except 997) - indicates
serial numbers up to and including 999,
EXCEPT 997.
• (SN 1000 - 2000 except 1996 including 997) -
indicates serial numbers between 1000 and
2000, INCLUDING 997 EXCEPT 1996.
• (SN 2001 and up including 1996) - indicates
serial numbers including 2001 and after,
INCLUDING 1996.
Unless otherwise specified, all cap screws and
bolts are Grade 8.8, cadmium or zinc plated.
NOTE:The following abbreviations may be
used herein:
ASSD............... Assembled
ASSY............... Assembly
AR ................... As Required
CB.................... Carriage Bolt
CP.................... Cotter Pin
CS.................... Cap Screw (Hexagon Head)
CYL................. Cylinder
DIA.................. Diameter
DIN.................. Deutsches Institut für Normung
FHCS............... Flat Head Cap Screw
GR ................... Grade
HB ................... Hex Bolt
HLN................. Hex Lock Nut
HN................... Hex Nut
HP.................... High Pressure
HYD................ Hydraulic
INS .................. Insert
LH.................... Left Hand
LN.................... Lock Nut
LT .................... Left
LW................... Lock Washer
M ..................... Meter or Meters
MM/mm .......... Millimeter
NPT.................. National Pipe Threaded
NSS.................. Not Sold Separately
RH ................... Right Hand
RT.................... Right
SHCS............... Socket Head Cap Screw
SLTD ............... Slotted
SN.................... Serial Number or Slotted Nut
SQ.................... Square
W/.................... With
W/O................. Without
ZO.................... Zinc Oxide
ZY.................... Zinc Yellow

TABLE OF CONTENTS
Printed in U.S.A 1 918049/GP0109
Introduction..................... Inside Front Cover
Table of Contents.........................................1
Decal Locations ...........................................3
Undercarriage, Rubber Track.......................9
Undercarriage, Steel Track (Option)..........16
Track Tensioner, Rubber Track.................24
Track Tensioner, Steel Track (Option)......25
Chassis .......................................................26
Chassis Lubrication....................................28
Counterweight............................................30
Rear Wall and Engine Hood......................31
Valve Cover...............................................32
Dipper Arm, Short .....................................34
Dipper Arm, Long......................................36
Connecting Link ........................................38
Boom..........................................................39
Dozer Blade ...............................................40
Canopy.......................................................41
Cab.............................................................42
Mirrors (Option) ........................................47
Cab/Canopy Sun Visor (Option)................48
Cab Door....................................................49
Cab Front Window.....................................50
Cab Sliding Window..................................51
Cab Windows.............................................52
Cab Interior Floor Trim .............................53
Operator’s Seat (Cab) ................................54
Operator’s Seat (Canopy) ..........................56
Cab Heater .................................................58
Diesel Engine.............................................61
Engine Mounts...........................................64
Cylinder Block...........................................65
Cylinder Head & Valve Cover...................66
Camshaft....................................................69
Crankshaft..................................................72
Crankshaft Seal..........................................75
Oil Pan .......................................................78
Oil Lubrication System..............................81
Fuel Injection Equipment...........................84
Cooling System..........................................87
Air Intake System ......................................89
Intake Manifold..........................................91
Exhaust System..........................................93
Fuel Tank...................................................96
Fuel System................................................99
Hydraulic Oil Pump.................................103
Throttle Lever..........................................104
Cooling System........................................106
Oil Cooler ................................................108
Oil Cooler Hose Installation....................109
Turntable Drive Unit................................110
Turntable Drive Unit Hose Installation ...111
Drive Motor .............................................112
Drive Motor Hose Installation.................114
Hydraulic Oil Tank..................................116
Hydraulic Pump External Parts................117
Hydraulic Pump Internal Parts.................118
Hydraulic Pump Hose Installation...........119
Control Valve...........................................120
Pilot Oil Supply Unit ...............................125
Swivel Joint..............................................126
Joysticks...................................................128
Manifold Block........................................131
Joystick Hose Installation........................132
Travel Pilot Valve....................................134
Travel Pilot Valve Hose Installation........136
Selection Valve........................................138
Reversing Valve (Dozer Blade)...............139
Selection Valve (House Tilt) ...................140
ISO/SAE Valve........................................141
Proportional Valve (Option)....................142
Prop. Valve Hose Installation (Option) ...143
Lock Valve...............................................144
Control Valve Tubes................................146
Boom Cylinder.........................................148
Dipper Arm Cylinder...............................150
Bucket Cylinder.......................................151
Swivel Cylinder .......................................152
Swivel Cylinder Hose Installation...........153
Dozer Blade Cylinder ..............................154
Dozer Blade Cylinder Hose Installation..156
Dozer Blade Cylinder ..............................158
Dozer Blade Cylinder Hose Installation..159
Dozer Blade Operation ............................160
Boom Hoses Installation..........................161
Auxiliary Hydraulics Pedal Operation.....162
Tilt Cylinder.............................................163
Tilt Cylinder Hose Installation ................164

TABLE OF CONTENTS
918049/GP0109 2 Printed in U.S.A
Battery......................................................165
Boom Work Light....................................166
Cab Work Lights (Option).......................167
Rotating Beacon (Option)........................168
Main Wire Harness..................................169
Chassis Wire Harness ..............................170
Engine Wire Harness ...............................171
Armrest Wire Harness .............................172
Proportional Control
Wire Harness (Option).........................174
Radio (Option).........................................175
Tools ........................................................176
Alphabetical Index...................................177
Numerical Index ......................................179

DECAL LOCATIONS
Printed in U.S.A 3 918049/GP0109
GENERAL INFORMATION
Decal location information is provided to assist in
the proper selection and application of new decals,
in the event the original decals become damaged or
the machine is repainted. The listing includes decal
illustration reference number, part number,
description and quantity information. Refer to the
illustrations for appropriate replacement locations.
To ensure proper selection of the correct replace-
ment decals, compare all of the various closeup
location drawings to the machine before starting to
refinish the unit. Then circle each decal shown
(applicable to the machine) while checking off its
part number in the listing. After verifying all the
decals needed for replacement, place any extra
unnecessary decals aside for disposal.
NOTE: Refer to the SAFETY chapter of the
Operator's Manual for the specific information
provided on the various safety decals furnished
in the decal kit(s).

DECAL LOCATIONS
918049/GP0109 4 Printed in U.S.A
NEW DECAL APPLICATION
Surfaces MUST be free from dirt, dust, grease and
other foreign material before applying the new decal.
To apply, remove the smaller portion of the decal
backing paper and apply this part of the exposed
adhesive backing to the clean surface while maintain-
ing proper position and alignment. Peel the other por-
tion of the backing paper off slowly while applying
hand pressure to smooth out the decal surface.
CAUTION
ALWAYS follow safety precautions on decals.
Replace the decals if they are damaged, or if
the unit is repainted. If repainting, BE SURE all
applicable decals are affixed to the unit.
The Compact Excavator decal kit is as follows:
PAINT NOTICE
Use this list to order paint for refinishing:
167784 4 qts. Construction Yellow (MUSTANG)
167778 4 qts. Light Gray (MUSTANG)
167772 4 qts. Dark Gray (MUSTANG)
167785 6 (12.8 oz. Spray Cans) Yellow (MUSTANG)
167773
6 (12.8 oz. Spray Cans) Dark Gray (MUSTANG)
167779 6 (12.8 oz. Spray Cans) Light Gray (MUSTANG)
Ref.
No. Part No. Description Qty.
163990 Decal Kit - ME3503 1
163991 Decal Kit - ME3703 1
1 161965 Diesel Fuel 1
2 161966 Hydraulic Oil 1
3 161969 WARNING - Hydraulic Reservoir 1
4 161967 Lubrication 1
5 161986 WARNING - Read Manual 1
6 165906 Glow Plug 1
7 163974 Throttle Speed 1
8 164854 WARNING - Avoid Injury 1
9 161968 Heater Valve (cab models only) 1
10 179730 Bypass Ball Valve 1
11 163978 WARNING - Hot Surface 1
12 163977 WARNING - Entanglement Hazard 1
13 161987 WARNING - Rotating Fan 1
14 161985 WARNING - Keep Away 2
15 163993 Graphic RT 1
16 165907 Graphic LT 1
17 164853 Engine Compartment Latch 1
18 162832 Hydraulics Compartment Latch 1
19 163979 ISO/SAE Valve Position 1
20 203786 3503 Lifting Capacity* 1
203799 3703 Lifting Capacity** 1
21 161981 Lift Point 4
22 161982 Tiedown Point 4
23 161970 Arrow 2
24 163975 WARNING - Avoid Injury 2
25 179704 WARNING - Counterweight 2
26 163973 WARNING - Mandatory Shutdown 1
27 163976 WARNING - Avoid Injury 1
28 162452 Joystick Control RT 1
29 162450 Travel LT 1
30 162451 Travel RT 1
31 162453 Joystick Control LT 1
32 179687 Dozer Blade Control 1
33 165900 Cabin Tilt Control** 4
34 137571 MUSTANG (4.64" x 26.08") 1
35 270244 MUSTANG (3.61" x 20.29")c3
36 164993 ME3503a2
164994 ME3703b2
37 202458 MUSTANG (2.31" x 13") 1
aUsed on ME3503 model only.
bUsed on ME3703 model only.
cTwo used on cab models, three on canopy models.

DECAL LOCATIONS
Printed in U.S.A 5 918049/GP0109
13
2
4
5
689
11 13
12 14 (both sides)
10
7
15
16

DECAL LOCATIONS
918049/GP0109 6 Printed in U.S.A
NOTE:The following is a duplicate listing from
page 4 for conveniently selecting decals from
the appropriate illustrations.
The Compact Excavator decal kit is as follows:
Ref.
No. Part No. Description Qty.
163990 Decal Kit - ME3503 1
163991 Decal Kit - ME3703 1
1 161965 Diesel Fuel 1
2 161966 Hydraulic Oil 1
3 161969 WARNING - Hydraulic Reservoir 1
4 161967 Lubrication 1
5 161986 WARNING - Read Manual 1
6 165906 Glow Plug 1
7 163974 Throttle Speed 1
8 164854 WARNING - Avoid Injury 1
9 161968 Heater Valve (cab models only) 1
10 179730 Bypass Ball Valve 1
11 163978 WARNING - Hot Surface 1
12 163977 WARNING - Entanglement Hazard 1
13 161987 WARNING - Rotating Fan 1
14 161985 WARNING - Keep Away 2
15 163993 Graphic RT 1
16 165907 Graphic LT 1
17 164853 Engine Compartment Latch 1
18 162832 Hydraulics Compartment Latch 1
19 163979 ISO/SAE Valve Position 1
20 203786 3503 Lifting Capacity* 1
203799 3703 Lifting Capacity** 1
21 161981 Lift Point 4
22 161982 Tiedown Point 4
23 161970 Arrow 2
24 163975 WARNING - Avoid Injury 2
25 179704 WARNING - Counterweight 2
26 163973 WARNING - Mandatory Shutdown 1
27 163976 WARNING - Avoid Injury 1
28 162452 Joystick Control RT 1
29 162450 Travel LT 1
30 162451 Travel RT 1
31 162453 Joystick Control LT 1
32 179687 Dozer Blade Control 1
33 165900 Cabin Tilt Control** 4
34 137571 MUSTANG (4.64" x 26.08") 1
35 270244 MUSTANG (3.61" x 20.29")c3
36 164993 ME3503a2
164994 ME3703b2
37 202458 MUSTANG (2.31" x 13") 1
aUsed on ME3503 model only.
bUsed on ME3703 model only.
cTwo used on cab models, three on canopy models.
Ref.
No. Part No. Description Qty.

DECAL LOCATIONS
Printed in U.S.A 7 918049/GP0109
17
18
19 21
23
24
25 21
26
27
28 29 30 31 32 33
34
37
35 35
35 36 35 36
(both sides)
20
22 22

NOTES
918049/GP0109 8 Printed in U.S.A