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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 Caterpillar 350/350L 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 |
Caterpillar 350/350L Common Problems This Manual Covers
Machine overheats under load
Start with coolant level, the most common trigger, then work the Cooling System testing procedure: radiator core blockage, water pump bearing play, and temperature sender wiring. The section gives test steps so you replace the failed part, not the whole system.
Manual Section: Cooling System p. 596Slow hydraulics or low digging power
Run the cycle-time checks at 2100 rpm with 55°C oil and compare against the factory table, then verify line relief pressure at 33 300 kPa (4850 psi). The Hydraulic System Testing and Adjusting section sequences the tests so you isolate pump, relief valve, or cylinder leakage.
Manual Section: Hydraulic System p. 2789Final drive leaking gear oil or making noise
Catch it early: check for planetary gear oil leaks and metal in the oil before the drive grenades. The Power Train section covers final drive disassembly and assembly step by step, including bearing and seal replacement, which beats a five-figure exchange unit.
Manual Section: Power Train p. 4209Hard starting or intermittent electrical faults
On this machine the usual suspects are battery cables, the starting circuit, and chafed harness sections, not electronics. Use the Electrical and Starting System tests along with the 2ZL/3ML electrical schematics to trace voltage drop wire by wire instead of swapping parts.
Manual Section: Electrical And Starting System p. 702Frequently Asked Questions
How do I reset error codes on a Caterpillar 350?
You don't, because there are none to reset. The 350/350L is a mid-90s machine with a 3306 mechanical diesel: no ECU fault codes, no diagnostic display, no DEF. Troubleshooting on this machine is done with a pressure gauge and a stopwatch, and the Testing and Adjusting sections walk you through it tap by tap. If a seller tells you they 'cleared the codes' on one of these, walk away.
How can I tell if the hydraulic pumps are worn before tearing anything down?
Run the factory cycle-time test in the Hydraulic System section: engine at 2100 ± 50 rpm, oil at 55 ± 5°C. Boom raise should take 4.6 ± 0.5 s, boom lower 3.2 ± 0.5 s, stick in 5.0 ± 0.5 s, bucket close 3.5 ± 0.5 s, a full swing 5.9 ± 0.8 s, and travel 15.5 ± 2.0 s in HIGH. Times outside those windows point you to pump flow, relief settings, or internal leakage, and the manual tells you which test comes next. p. 2960
Does this cover checking and setting the relief valves?
Yes, with the actual settings. Boom, stick and bucket line reliefs go to 33 300 ± 980 kPa (4850 ± 140 psi), swing relief to 27 000 + 490 / - 980 kPa (3900 psi), and travel crossover reliefs to 36 300 ± 980 kPa (5250 ± 140 psi). The Testing and Adjusting section shows where to tee in the gauge and how to adjust, and the Hydraulic Schematics section lets you trace the circuit when a reading doesn't make sense. p. 2960
My 350 works a scrap magnet. Is the magnet system covered?
Yes. The bundle includes the magnet and solid state magnetic controller testing material along with the full electrical schematics for the 2ZL and 3ML machines. That combination is what you need when the magnet drops load mid-swing or won't release, since the fault is almost always in the controller output or the wiring, not the magnet coil itself.
Is engine work included, or just the excavator side?
Both. Basic Engine, Fuel System, Air Inlet and Exhaust, Cooling, Lubrication, and Electrical and Starting are all here with disassembly and assembly steps. Real numbers to hold it to: minimum oil pressure 250 kPa (36 psi) at full load rpm and 100 kPa (14 psi) at low idle, maximum oil temperature 110°C (230°F), and both the oil cooler and oil filter bypass valves opening at a 172 ± 21 kPa (25 ± 3 psi) pressure difference.
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