Caterpillar 303.5 Mini Hydraulic Excavator service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.

RENR3538 - Disassembly and Assembly (303.5 Mini Hydraulic Excavator Machine Systems)
RENR3536 - Testing and Adjusting (303.5 Mini Hydraulic Excavator)
RENR3535 - Systems Operation (303.5 Mini Hydraulic Excavator)
RENR3534 - Specifications (303.5 Mini Hydraulic Excavator)
RENR3539 - Schematic (303.5 and 304.5 Mini Hydraulic Excavator Electrical System)
RENR3533 - Disassembly and Assembly (303.5 Mini Hydraulic Excavator)
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RENR3537 - Schematic (303.5 Mini Hydraulic Excavator Hydraulic System)...2
RENR3533 - Disassembly and Assembly (303.5 Mini Hydraulic Excavator)...4
  Alternator - Remove and Install...7
  Bearing Clearance - Check...9
  Camshaft - Install...12
  Camshaft - Remove...15
  Connecting Rod Bearings - Install...18
  Connecting Rod Bearings - Remove...20
  Coolant Temperature Switch - Remove and Install...22
  Crankshaft - Install...25
  Crankshaft - Remove...27
  Crankshaft Front Seal - Install...29
  Crankshaft Front Seal - Remove...31
  Crankshaft Main Bearings - Install...34
  Crankshaft Main Bearings - Remove...36
  Crankshaft Pulley - Remove and Install...38
  Crankshaft Rear Seal - Install...41
  Crankshaft Rear Seal - Remove...43
  Cylinder Head - Install...45
  Cylinder Head - Remove...49
  Electric Starting Motor - Remove and Install...54
  Engine Oil Pan - Remove and Install...56
  Engine Oil Pressure Switch - Remove and Install...59
  Engine Oil Pump - Install...62
  Engine Oil Pump - Remove...67
  Engine Oil Relief Valve - Remove and Install...71
  Exhaust Manifold - Remove and Install...74
  Fan - Remove and Install...77
  Flywheel - Install...80
  Flywheel - Remove...84
  Flywheel Housing - Remove and Install...88
  Fuel Filter Base - Assemble...95
  Fuel Filter Base - Disassemble...98
  Fuel Filter Base - Install...101
  Fuel Filter Base - Remove...103
  Fuel Injection Lines - Remove and Install...106
  Fuel Injection Nozzles - Install - 3013, 3014 and 3024 Engines...109
  Fuel Injection Nozzles - Remove - 3013, 3014 and 3024 Engines...111
  Fuel Injection Pump - Install...113
  Fuel Injection Pump - Remove...116
  Fuel Shutoff Solenoid - Remove and Install...119
  Fuel Transfer Pump - Install...122
  Fuel Transfer Pump - Remove...124
  Glow Plugs - Remove and Install...126
  Housing (Front) - Install...129
  Housing (Front) - Remove...131
  Inlet Manifold - Install - 3013, 3014, and 3024 Engines...133
  Inlet Manifold - Remove - 3013, 3014, and 3024 Engines...135
  Inlet and Exhaust Valve Springs - Remove and Install...138
  Inlet and Exhaust Valves - Remove and Install...142
  Lifter Group - Remove and Install...147
  Pistons and Connecting Rods - Assemble...150
  Pistons and Connecting Rods - Disassemble...156
  Pistons and Connecting Rods - Install...160
  Pistons and Connecting Rods - Remove...164
  Rocker Shaft - Assemble - 3013, 3014, and 3024 Engines...166
  Rocker Shaft - Disassemble - 3013, 3014 and 3024 Engines...169
  Rocker Shaft and Pushrod - Install - 3013, 3014 and 3024 Engines...171
  Rocker Shaft and Pushrod - Remove - 3013, 3014 and 3024 Engines...173
  V-Belts - Remove and Install...175
  Valve Mechanism Cover - Remove and Install...178
  Water Pump - Install - 3013, 3014, and 3024 Engines...183
  Water Pump - Remove - 3013, 3014, and 3024 Engines...185
  Water Temperature Regulator - Remove and Install...187
  Water Temperature Regulator Housing - Remove and Install...190
RENR3534 - Specifications (303.5 Mini Hydraulic Excavator)...193
  Bank Valve and Mounting...194
  Blade Cylinder...197
  Boom Cylinder...199
  Boom Swing Cylinder...201
  Bucket Cylinder...203
  Gerotor Motor (Swing)...205
  Hydraulic Tank...206
  Load Control Valve (Boom)...208
  Pilot Valve (Joystick)...209
  Pilot and Travel Speed Manifold...211
  Piston Motor (Travel)...213
  Piston and Gear Pump...215
  Recoil Spring...217
  Solenoid Valve (Work Tool Lowering)...218
  Speed and Direction Control...219
  Sprocket...220
  Stick Cylinder...221
  Swing Gear and Bearing...223
  Track Roller...225
  Track...226
RENR3535 - Systems Operation (303.5 Mini Hydraulic Excavator)...227
  Bank Valve...228
  Boom Hydraulic System...259
  Bucket Hydraulic System...261
  Combined Function Hydraulic Operation...263
  General Information...265
  Gerotor Motor (Swing)...270
  Pilot Hydraulic System...273
  Pilot Valve (Joystick)...278
  Pilot and Travel Speed Manifold...282
  Piston Motor (Travel)...284
  Piston and Gear Pump...287
  Return Hydraulic System...293
  Solenoid Valve (Work Tool Lowering)...295
  Stick Hydraulic System...297
  Swing System...299
  Swivel...301
  Travel System...303
RENR3536 - Testing and Adjusting (303.5 Mini Hydraulic Excavator)...305
  Accumulator (Pilot) - Test and Charge...306
  Gerotor Motor (Swing) - Test...312
  Hydraulic Oil Contamination - Test...324
  Hydraulic System Pressure - Release...326
  Hydraulic System Troubleshooting...328
  Load Control Valve (Boom) - Test and Adjust...334
  Machine Preparation...338
  Operational Checks...340
  Pilot System Pressure - Test...350
  Piston and Gear Pump - Test and Adjust...353
  Relief Valve (Line) - Test and Adjust...356
  Relief Valve (Main) - Test and Adjust...373
  Visual Inspection...383
  Worksheets - Troubleshoot...385
RENR3538 - Disassembly and Assembly (303.5 Mini Hydraulic Excavator Machine Systems)...391
  Accumulator (Hydraulic Pilot) - Remove and Install...394
  Bank Valve - Assemble...396
  Bank Valve - Disassemble...410
  Bank Valve - Install...423
  Bank Valve - Remove...434
  Blade - Remove and Install...444
  Blade Cylinder - Remove and Install...448
  Boom - Remove and Install...453
  Boom Cylinder - Remove and Install...461
  Boom Lowering Control Valve - Remove and Install...468
  Boom Swing Cylinder - Remove and Install...475
  Bucket - Remove and Install...481
  Bucket Cylinder - Remove and Install...486
  Bucket Linkage - Remove and Install...490
  Cab - Remove and Install...494
  Cab Heater - Remove and Install...500
  Counterweight - Remove and Install...503
  Duo-Cone Conventional Seals - Install...512
  Final Drive Sprocket - Remove and Install...519
  Front Idler - Assemble...522
  Front Idler - Disassemble...524
  Front Idler and Track Adjuster - Install...526
  Front Idler and Track Adjuster - Remove...528
  Fuel Tank - Install...530
  Fuel Tank - Remove...534
  Gear Pump - Install...539
  Gear Pump - Remove...543
  Gerotor Motor (Swing) - Assemble...547
  Gerotor Motor (Swing) - Disassemble...564
  Gerotor Motor (Swing) - Install...579
  Gerotor Motor (Swing) - Remove...583
  Hydraulic System Pressure - Release...588
  Hydraulic Tank - Remove and Install...589
  Pilot Valve (Joystick) - Assemble...599
  Pilot Valve (Joystick) - Disassemble...601
  Pilot Valve (Joystick) - Install...603
  Pilot Valve (Joystick) - Remove...612
  Pilot and Travel Speed Manifold - Remove and Install...621
  Piston Motor (Travel) - Assemble...629
  Piston Motor (Travel) - Install...649
  Piston Motor (Travel) - Remove...652
  Piston Pump - Assemble...676
  Piston Pump - Disassemble...687
  Piston Pump - Install...695
  Piston Pump - Remove...700
  Piston and Gear Pump - Install...705
  Piston and Gear Pump - Remove...710
  Recoil Spring - Assemble...715
  Recoil Spring - Disassemble...718
  Recoil Spring - Install...720
  Recoil Spring - Remove...722
  Seat - Remove and Install...724
  Stick - Remove and Install...727
  Stick Cylinder - Remove and Install...734
  Swing Gear and Bearing - Remove and Install...740
  Swivel - Assemble...744
  Swivel - Disassemble...748
  Swivel - Install...752
  Swivel - Remove...757
  Track - Remove and Install...762
  Track Adjuster - Assemble...767
  Track Adjuster - Disassemble...769
  Track Carrier Roller - Remove and Install...771
  Track Roller - Remove and Install...776
  Undercarriage Frame - Remove and Install...781
RENR3539 - Schematic (303.5 and 304.5 Mini Hydraulic Excavator Electrical System)...794
  Collage...795
  Main...810
KENR6786 - Disassembly and Assembly (S3Q2 and S3Q2-T Egnines)...812
  Air Inlet and Exhaust System - Inspect...814
  Air Inlet and Exhaust System - Install...815
  Air Inlet and Exhaust System - Remove...817
  Cooling System - Disassemble_Inspect_Assemble...819
  Cooling System - Install...823
  Cooling System - Remove...825
  Cylinder Head and Valve Mechanism - Assemble...827
  Cylinder Head and Valve Mechanism - Disassemble and Inspect...834
  Cylinder Head and Valve Mechanism - Inspect and Repair...840
  Electrical System - Disassemble_Inspect_Assemble...854
  Electrical System - Install...881
  Electrical System - Remove...883
  Flywheel - Assemble...889
  Flywheel - Disassemble and Inspect...892
  Flywheel - Inspect and Repair...896
  Fuel System - Disassemble_Inspect_Assemble...898
  Fuel System - Install...904
  Fuel System - Remove...906
  General Information...909
  General Tools...911
  Lubrication System - Disassemble_Inspect_Assemble...913
  Lubrication System - Install...919
  Lubrication System - Remove...922
  Piston, Connecting Rod, Crankshaft, and Cylinder Block - Assemble...927
  Piston, Connecting Rod, Crankshaft, and Cylinder Block - Disassemble and Inspect...940
  Piston, Connecting Rod, Crankshaft, and Cylinder Block - Inspect and Repair...951
  Special Tools...973
  Timing Gear, Camshaft, and Oil Pan - Assemble...975
  Timing Gear, Camshaft, and Oil Pan - Disassemble and Inspect...984
  Timing Gear, Camshaft, and Oil Pan - Inspect and Repair...993
KENR6786 - Specifications (S3Q2 and S3Q2-T Egnines)...1002
  Engine Design...1003
  Engine Specifications...1009
  General Torque Information...1013
  Inspection Information...1020
KENR6786 - Systems Operation (S3Q2 and S3Q2-T Egnines)...1037
  Engine Information...1038
  Governor Control - Automatic Engine Speed Control...1045
KENR6786 - Testing and Adusting (S3Q2 and S3Q2-T Egnines)...1047
  Compression - Test...1048
  Engine Inspection Record Sheet...1050
  Engine Valve Lash - Inspect_Adjust...1065
  Fuel System - Prime...1070
  Governor - Adjust...1071
  High Idle RPM - Adjust...1072
  Initial Startup Procedure...1073
  Low Idle RPM - Adjust...1075
  Operational Checks...1078
  Overhaul Considerations...1080
  Rack (Maximum Output) - Adjust...1081
  Safety Messages and Their Care...1082
  Speed Variation - Measure...1084
  Speed Variation Rate - Adjust...1086
  Troubleshooting - Automatic Engine Speed Control...1088
  V-Belt - Test...1091

EXCERPT:
1. Move the machine to a smooth horizontal location. Move the machine away from other machines and personnel. Lower the blade to the ground. Lower the boom, the stick and the bucket to the ground. Stop the engine.
2. Put chocks in front of the tracks and behind the tracks.
3. Raise the blade for tests and adjustments. Properly support the blade.
Note: Unless a system test requires the front of the machine off the ground, do not stop the engine with the front of the machine off the ground. Lower the machine to the ground and stop the engine.
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