BASIC ENGINE
PISTON & ROD GPCRANKSHAFT GP
VALVE MECHANISM GP
LUBRICATION SYSTEM
BREATHER GPFILLER GP-ENGINE OIL
FILTER GP-ENGINE OIL
AIR INLET AND EXHAUST SYSTEM
TURBOCHARGER GPBASIC ENGINE
HOUSING GP-FRONTCOOLING SYSTEM
COOLER GPBASIC ENGINE
PISTON & ROD GP#SEBP44600030
283-3158: PISTON & ROD GP
  283-3158 PISTON & ROD GP 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 1. | 270-6168 | [1] | PISTON AS (STANDARD) | |
| 270-6171 B | [1] | PISTON AS (0.25-MM OS) | ||
| 270-6172 B | [1] | PISTON AS (0.5-MM OS) | ||
| 2. | 283-1256 | [1] | RING SET (STANDARD) | |
| 283-1261 B | [1] | RING SET (0.25-MM US) | ||
| 283-1262 B | [1] | RING SET (0.50-MM US) | ||
| 3. | 270-6170 | [1] | PIN-PISTON | |
| 4. | 8C-3312 | [2] | RING-RETAINING | |
| 5. | 272-0445 | [1] | ROD AS-CONNECTING | |
| 5A. | 128-2955 | [2] | BOLT-CONNECTING ROD | |
| 5B. | 128-2956 | [2] | NUT | |
| 5C. | 283-1257 | [1] | BEARING (STANDARD) | |
| 283-1258 B | [1] | BEARING (0.25-MM US) | ||
| 283-1259 B | [1] | BEARING (0.50-MM US) | ||
| 283-1260 B | [1] | BEARING (0.75-MM US) | ||
| 5D. | 270-6175 | [1] | BEARING | |
| B | USE AS REQUIRED | |||
#SEBP44600031
283-1281: PULLEY GP-CRANKSHAFT
  283-1281 PULLEY GP-CRANKSHAFT 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS#SEBP44600032
283-1279: VALVE MECHANISM GP
  283-1279 VALVE MECHANISM GP 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 1. | 250-4776 | [3] | VALVE (INLET) | |
| 2. | 270-6196 | [3] | VALVE-EXHAUST | |
| 3. | 103-2782 | [6] | SPRING | |
| 4. | 5I-7625 | [6] | RETAINER (INTAKE VALVE) | |
| 5. | 5I-7719 | [12] | RETAINER (EXHAUST VALVE) | |
| 6. | 5I-7630 | [6] | CAP | |
| 7. | 270-6197 | [6] | SEAL-VALVE STEM | |
| 8. | 283-1280 | [1] | SHAFT AS-ROCKER ARM | |
| 9. | 270-6199 | [6] | ROCKER ARM AS | |
| 9A. | 199-2194 | [1] | NUT | |
| 9B. | 270-6200 | [1] | SCREW | |
| 10. | 270-6201 | [3] | BRACKET | |
| 11. | 199-2201 | [3] | BOLT (M8X1.25X61.5-MM) | |
| 12. | 221-5250 | [2] | SPRING | |
| 13. | 195-8324 | [2] | RING-SNAP | |
| 14. | 270-6203 | [3] | BOLT | |
| 15. | 103-9272 | [6] | TAPPET | |
| 16. | 103-9273 | [6] | PUSHROD | 
#SEBP44600033
320-1081: BREATHER GP
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 270-6212 | [2] | BOLT | ||
| 320-1039 | [1] | BOLT | ||
| 320-1045 | [1] | BOLT | ||
| 5I-4936 M | [2] | BOLT (M10X1.25X20-MM) | ||
| 8T-4200 M | [3] | BOLT (M8X1.25X16-MM) | ||
| 355-0474 | [1] | BRACKET | ||
| 320-1049 | [8] | CLIP-HOSE | ||
| 320-1037 | [1] | GAUGE AS-OIL LEVEL (DIPSTICK) (ENGINE) | ||
| 320-1025 | [1] | HOSE | ||
| 320-1026 | [1] | HOSE | ||
| 320-1027 | [1] | HOSE | ||
| 320-1028 | [1] | HOSE | ||
| 3B-4505 | [3] | LOCKWASHER | ||
| 7X-0796 | [2] | LOCKWASHER (10.2X18.4X2.5-MM THK) | ||
| 320-1029 | [1] | PIPE-BREATHER | ||
| 320-1038 | [1] | PIPE-BREATHER | ||
| 5I-4993 | [1] | SEAL | ||
| 320-1032 | [1] | SEPARATOR-OIL | ||
| 320-1030 | [1] | SPACER | ||
| 320-1033 | [1] | TUBE AS-OIL GAUGE | ||
| 223-0279 | [1] | WASHER | ||
| 8T-4224 | [1] | WASHER-HARD (8.8X16X2-MM THK) | ||
| M | METRIC PART | |||
#SEBP44600034
321-0602: BREATHER GP
#SEBP44600035
280-3721: FILLER GP-ENGINE OIL
  280-3721 FILLER GP-ENGINE OIL 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS#SEBP44600036
274-6495: FILTER & MTG GP-ENGINE OIL
  274-6495 FILTER & MTG GP-ENGINE OIL 
PART OF 288-3921, 317-9743 INSTALLATION AR-ENGINE
PART OF 288-3921, 317-9743 INSTALLATION AR-ENGINE
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 1. | 7K-1181 | [1] | STRAP-CABLE | |
| 2. | 096-9532 | [8] | WASHER (15.8X22.5X2-MM THK) | |
| 3. | 120-0664 | [1] | FILTER-ENGINE OIL | |
| 4. | 232-2989 | [1] | BRACKET | |
| 5. | 232-2991 | [4] | BOLT-SPECIAL (BANJO) | |
| 6. | 267-4379 | [1] | HOSE AS | |
| 7. | 267-4380 | [1] | HOSE AS | |
| 8. | 274-6499 | [1] | SUPPORT | |
| 9. | 8T-4121 | [4] | WASHER-HARD (11X21X2.5-MM THK) | |
| 10. | 8T-4136 M | [4] | BOLT (M10X1.5X25-MM) | |
| 11. | 7I-7439 E | GUARD-HOSE (60-CM) | ||
| E | ORDER BY THE CENTIMETER | |||
| M | METRIC PART | |||
#SEBP44600037
283-3168: LINES GP-TURBOCHARGER OIL
  283-3168 LINES GP-TURBOCHARGER OIL 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 1. | 2A-5222 | [2] | WASHER (10.3X15.9X1-MM THK) | |
| 2. | 5I-5077 | [2] | CLAMP | |
| 3. | 5C-2890 M | [1] | NUT (M6X1-THD) | |
| 4. | 5I-7623 | [1] | BOLT (M10X1.25X20-MM) | |
| 5. | 5I-7689 | [1] | GASKET | |
| 6. | 5I-8058 | [1] | CONNECTOR | |
| 7. | 5I-8109 | [1] | HOSE | |
| 8. | 8T-4138 M | [1] | BOLT (M6X1X20-MM) | |
| 9. | 096-2500 | [1] | LOCKWASHER | |
| 10. | 096-4841 | [2] | CLAMP-HOSE | |
| 11. | 8T-4189 M | [2] | BOLT (M8X1.25X20-MM) | |
| 12. | 199-2333 | [2] | BOLT | |
| 13. | 280-3807 | [1] | GASKET | |
| 14. | 283-3169 | [1] | TUBE-OIL | |
| 15. | 283-3170 | [1] | TUBE-OIL | |
| 16. | 280-3757 | [1] | TUBE-OIL | |
| M | METRIC PART | |||
#SEBP44600038
283-3163: PUMP GP-ENGINE OIL
  283-3163 PUMP GP-ENGINE OIL 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 1. | 103-9725 | [1] | VALVE AS-RELIEF | |
| 2. | 233-5496 | [1] | GASKET | |
| 3. | 270-6233 | [1] | BOLT | |
| 4. | 270-6234 | [1] | GASKET | |
| 5. | 283-3164 | [1] | PUMP AS-ENGINE OIL | |
| 270-6239 | [1] | PUMP AS-OIL | ||
| 5A. | 8T-4138 M | [2] | BOLT (M6X1X20-MM) | |
| 096-2500 | [2] | LOCKWASHER | ||
| 5B. | 270-6237 | [1] | GASKET | |
| 5C. | 283-3165 | [1] | STRAINER-OIL (ENGINE OIL PUMP) | |
| 6. | 195-8453 | [1] | SWITCH AS-PRESSURE (ENGINE OIL) | |
| 7. | 5I-8056 | [1] | PLUG | |
| 8. | 5I-7628 | [1] | GASKET | |
| M | METRIC PART | |||
#SEBP44600039
283-1292: COOLER GP-ENGINE OIL
  283-1292 COOLER GP-ENGINE OIL 
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
PART OF 287-6714, 311-8446, 334-1977 ENGINE AR-PRIMARY
Parts for your 303.5C MINI HYD EXCAVATOR:
CATERPILLAR SIS| Pos. | Part No | Qty | Parts name | Comments | 
|---|---|---|---|---|
| 1. | 096-4841 | [3] | CLAMP-HOSE | |
| 2. | 5I-7632 | [1] | PIPE | |
| 3. | 095-0961 | [1] | CLAMP-HOSE | |
| 4. | 195-8243 | [2] | PLUG | |
| 5. | 195-8459 | [1] | JOINT AS | |
| 195-8460 | [1] | PLUG | ||
| 6. | 196-8227 | [2] | CLAMP | |
| 7. | 253-5484 | [1] | CONNECTOR | |
| 8. | 253-5486 | [1] | SEAL-O-RING | |
| 9. | 270-6247 | [1] | HOSE | |
| 10. | 270-6250 | [1] | COVER | |
| 11. | 270-6251 | [1] | WASHER | |
| 12. | 282-8584 | [1] | CONNECTOR | |
| 13. | 283-1293 | [1] | COOLER AS-ENGINE OIL | |
| 14. | 283-1294 | [1] | PIPE | |
| 15. | 283-1295 | [1] | HOSE | |
| 16. | 283-1296 | [1] | HOSE | 
Information:
BASIC ENGINE
 
PISTON & ROD GP
 
Tool Operating Manual 
  
Using the 242-3980 Piston Groove Gauge on 3500A and B Engines with Monotherm Pistons using the 329-2630 and 329-2631 Piston Groove Gauges on 3500B Engines with Monotherm Pistons{0374, 0599, 0700, 0701, 0705}
Using the 242-3980 Piston Groove Gauge on 3500A and B Engines with Monotherm Pistons using the 329-2630 and 329-2631 Piston Groove Gauges on 3500B Engines with Monotherm Pistons{0374, 0599, 0700, 0701, 0705}
      Using the 242-3980 Piston Groove Gauge on 3500A and B Engines with Monotherm Pistons using the 329-2630 and 329-2631 Piston Groove Gauges on 3500B Engines with Monotherm Pistons{0374, 0599, 0700, 0701, 0705}
NEHS1227: 477-3197 C27 Piston Ring Gauge Group {0374, 0599, 0700, 0701, 1214, 1215}
NEHS1227: 477-3197 C27 Piston Ring Gauge Group {0374, 0599, 0700, 0701, 1214, 1215}
     NEHS1227: 477-3197 C27 Piston Ring Gauge Group {0374, 0599, 0700, 0701, 1214, 1215}
Testing and Adjusting
       
Disassembly and Assembly 
  
Piston, Connecting Rod, Crankshaft, and Cylinder Block - Disassemble and Inspect
S3Q2 and S3Q2-T Engines
              S3Q2 and S3Q2-T Engines
 
 
  
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 

