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This is the factory repair library for the Caterpillar 350 and 350L hydraulic excavators (serial prefixes 2ZL, 3ML, 8HK, 9FL), built 1994-2001 around the 3306 mechanical diesel. You get 18 section PDFs plus hydraulic and electrical schematics, 4564 pages of Systems Operation, Testing and Adjusting, and Disassembly and Assembly. This is the book with the numbers a gauge job needs: line relief at 33 300 kPa (4850 psi), swing relief at 27 000 kPa (3900 psi), travel crossover at 36 300 kPa (5250 psi), and the full factory cycle-time table that tells you whether a pump is tired before you buy the machine. It also covers the magnet and solid state magnetic controller for material-handler setups.
What's Inside This Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Air Inlet and Exhaust System | 1-65 | Turbocharger, Aftercooler, Air Cleaner, Exhaust |
| Basic Engine | 66-595 | 3306 Engine Disassembly and Assembly, Head, Block, Crankshaft, Bearings |
| Cooling System | 596-701 | Radiator, Water Pump, Thermostat, Fan Drive, Cooling Tests |
| Electrical and Starting System | 702-2294 | Alternator, Starter, Batteries, Magnet Controller, Circuit Tests |
| Engine Arrangement | 2295-2327 | Engine Mounting and Arrangement |
| Frame and Body | 2328-2349 | Frame, Covers, Guards, Counterweight |
| Fuel System | 2350-2788 | Injection Pump, Injectors, Filters, Fuel Testing |
| Hydraulic System | 2789-3487 | Cycle Times, Line and Swing Relief Settings, Pumps, Valves, Cylinders, Swing Drive |
| Implements | 3488-3612 | Boom, Stick, Bucket, Linkage |
| Lubrication System | 3613-3676 | Oil Pump, Filters, Engine Oil Pressure Test |
| Machine Arrangement | 3677-3692 | Overall Machine Arrangement |
| Operator Station | 3693-4208 | Cab, Controls, Monitor, HVAC |
| Power Train | 4209-4263 | Travel Motors, Final Drives, Swing Drive |
| Service Equipment and Supplies | 4264-4335 | Special Tools, Service Supplies |
| Torque Specifications | 4336-4383 | Metric (Iso) and English (Sae) Standard Tightening Torques |
| Undercarriage | 4384-4461 | Track Chain, Rollers, Idlers, Track Adjuster |
| Work Tools | 4462-4493 | Bucket and Attachment Service |
| Hydraulic Schematics | 4494-4546 | Hydraulic System Schematics for Base and Attachment Configurations, Fluid Power Graphic Symbols |
| Electrical Schematics | 4547-4564 | Machine Electrical System Schematics (Incl. 2ZL 3ML), Magnetic Controller, Electrical Graphic Symbols |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine speed | 2100 ± 50 rpm | p. 2960 |
| Oil temperature | 55 ± 5°C (131 ± 9°F) | p. 2960 |
| Boom, stick and bucket line relief valve pressure setting | 33 300 ± 980 kPa (4850 ± 140 psi) | p. 2960 |
| Swing relief pressure setting | 27 000 + 490 - 980 kPa (3900 + 72 - 140 psi) | p. 2960 |
| Travel crossover relief pressure | 36 300 ± 980 kPa (5250 ± 140 psi) | p. 2960 |
| Boom raise cycle time | 4.6 ± 0.5 seconds | p. 2960 |
| Boom lower cycle time | 3.2 ± 0.5 seconds | p. 2961 |
| Stick out cycle time | 3.4 ± 0.5 seconds | p. 2961 |
| Stick in cycle time | 5.0 ± 0.5 seconds | p. 2961 |
| Bucket close cycle time | 3.5 ± 0.5 seconds | p. 2961 |
| Bucket open cycle time | 2.3 ± 0.5 seconds | p. 2961 |
| Swing cycle time | 5.9 ± 0.8 seconds | p. 2962 |
| Travel cycle time at High speed | 15.5 ± 2.0 seconds | p. 2963 |
| Travel cycle time at Low speed | 21.5 ± 2.0 seconds | p. 2963 |
| System Pressure (Oil - Minimum at full load rpm) | 250 kPa (36 psi) | p. 3621 |
