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This is the full factory repair set for the Caterpillar 330B L excavator (serial 6DR00001-UP, 1997-2001): Systems Operation, Testing and Adjusting, and Disassembly and Assembly bundled as 18 section PDFs, 6034 pages total. It covers the 3306 diesel and the pilot-operated hydraulic system the way Cat dealer techs work on them - with the actual test ports, tool numbers, and pressure values. You get main relief at 34300 kPa (4950 psi), stick and bucket line reliefs at 36800 kPa (5350 psi), swing at 29900 kPa (4350 psi), pilot at 4100 kPa (595 psi), plus full teardown procedures for pumps, main control valve, swing drive, final drives, and undercarriage. No guesswork, no forum numbers.
What's Inside This Caterpillar 330B L Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Air Inlet and Exhaust System | 1-69 | Turbocharger, Aftercooler, Exhaust, Air Cleaner Service |
| Basic Engine | 70-575 | 3306 Engine Disassembly and Assembly, Cylinder Head, Block, Crankshaft, Bearings |
| Cooling System | 576-694 | Radiator, Water Pump, Thermostat, Fan Drive, Cooling Tests |
| Electrical and Starting System | 695-2334 | Alternator, Starter, Batteries, Grounds, Wiring and Circuit Diagrams |
| Engine Arrangement | 2335-2387 | Engine Mounting and Arrangement Drawings |
| Frame and Body | 2388-2479 | Frame, Covers, Guards, Counterweight |
| Fuel System | 2480-2931 | Injection Pump, Injectors, Filters, Fuel System Testing |
| Hydraulic System | 2932-4239 | Pressure Specifications, Relief Valve Test and Adjust, Main and Pilot Pumps, Control Valves, Cylinders |
| Implements | 4240-4431 | Boom, Stick, Bucket, Linkage Service |
| Lubrication System | 4432-4497 | Oil Pump, Filters, Lubrication Routing and Pressures |
| Machine Arrangement | 4498-4511 | Overall Machine Arrangement Drawings |
| Operator Station | 4512-5497 | Cab, Controls, Monitor Panel, HVAC |
| Power Train | 5498-5583 | Travel Motors, Final Drives, Swing Drive, Drive Shafts |
| Schematics | 5584-5653 | Hydraulic and Electrical Schematics |
| Service Equipment and Supplies | 5654-5752 | Special Tools, Service Supplies, Sealants |
| Torque Specifications | 5753-5800 | Standard and Machine-Specific Tightening Torques for Bolts, Fittings and Hose Clamps |
| Undercarriage | 5801-5926 | Track Chain, Rollers, Idlers, Track Adjuster |
| Work Tools | 5927-6034 | Bucket and Attachment Service |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Relief Valve Pressure | 34300 ± 490 kPa (4950 ± 72 psi) | p. 3158 |
| Main Relief Valve Locknut Torque | 50 ± 10 N·m (37 ± 7 lb ft) | p. 3158 |
| Stick Cylinder Line (head end) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3158 |
| Stick Cylinder Line (rod end) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3158 |
| Bucket Cylinder Line (head end) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3158 |
| Bucket Cylinder Line (rod end) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3158 |
| Stick/Bucket Cylinder Line Relief Valve Locknut Torque | 20 ± 2 N·m (14 ± 4 lb ft) | p. 3158 |
| Swing Relief Pressure (right) | 29900 ± 980 kPa (4350 ± 140 psi) | p. 3159 |
| Swing Relief Pressure (left) | 29900 ± 980 kPa (4350 ± 140 psi) | p. 3159 |
| Swing Relief Pressure Locknut Torque | 160 ± 30 N·m (120 ± 22 lb ft) | p. 3159 |
| Left Travel Crossover Relief Valve (forward) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3159 |
| Left Travel Crossover Relief Valve (reverse) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3159 |
| Right Travel Crossover Relief Valve (forward) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3159 |
| Right Travel Crossover Relief Valve (reverse) Pressure | 36800 ± 1470 kPa (5350 ± 215 psi) | p. 3159 |
| Travel Crossover Relief Valve Locknut Torque | 130 ± 13 N·m (95 ± 10 lb ft) | p. 3159 |
Caterpillar 330B L Common Problems This Manual Covers
Final drive grinding, knocking, or whining with slow travel on one track
Usually a failed duo-cone seal letting dirt and water contaminate the gear oil, then bearings go. The Power Train section covers travel motor and final drive removal, full disassembly, bearing and gear inspection, seal installation, and reassembly torques so you can rebuild instead of buying an exchange unit.
Manual Section: Power Train p. 5498Engine loses power or bogs badly under digging load
On the mechanical 3306 this is almost always fuel delivery - plugged filters, a collapsing suction hose, or contaminated fuel - or air starvation from a dirty element or intake leak. The Fuel System section covers fuel pressure checks, transfer pump testing, and injection timing; cross-check restriction on the intake side in Air Inlet And Exhaust System.
Manual Section: Fuel System p. 2480Hydraulics run hot, feel weak, or move jerky
Start with the pressure checks before condemning a pump. The Hydraulic System testing section gives factory relief settings - main relief 34300 kPa, line reliefs 36800 kPa - plus pump flow and negative flow control test procedures, so you can isolate internal leakage in the pump, main control valve, or a cylinder instead of swapping parts blind.
Manual Section: Hydraulic System p. 2932Warning lights flicker, gauges act up, or the machine cranks poorly
On machines this age the culprit is usually corroded grounds, moisture in connectors, tired batteries, or a failing alternator. The Electrical And Starting System section covers charging and starting circuit tests, and the Schematics section gives you the full wiring diagrams to trace voltage drops wire by wire.
Manual Section: Electrical And Starting System p. 695Frequently Asked Questions
Does this manual give the real hydraulic pressure settings, or just tell me to see a dealer?
It gives the numbers. Main relief is 34300 ± 490 kPa (4950 ± 72 psi) with a locknut torque of 50 ± 10 N·m (37 ± 7 lb ft). It even tells you the adjustment screw sensitivity - one full turn on the main relief changes pressure about 14400 kPa (2100 psi) - so you know how far to turn before you ever crack the locknut. Test port locations and gauge hookup are all in Testing and Adjusting. p. 3157
My final drive is whining and the machine tracks slow on one side. Is the rebuild covered?
Yes. The Power Train section has complete disassembly and assembly of the travel motors and final drives - bearing removal, gear inspection, seal replacement, and reassembly. If a duo-cone seal let water and dirt into the gear oil, this is the section that walks you through the teardown so you catch it before the planetary gears are scrap.
Swing is sluggish or the machine drifts under load on a slope. What are the swing relief specs?
Swing relief pressure is 29900 ± 980 kPa (4350 ± 140 psi) both directions, locknut torque 160 ± 30 N·m (120 ± 22 lb ft), and one turn of the adjustment screw moves pressure about 11200 kPa (1625 psi). Testing and Adjusting shows where to tee in the gauge and how to load the circuit for an accurate reading. p. 3157
Do I need Cat ET or a laptop to work on a 330B L?
No. This is a late-90s machine with a mechanical 3306 and pilot-operated hydraulics - there is no DEF, no emissions computer, and no modern fault-code readout to plug into. Diagnosis is done the honest way: pressure gauges, flow checks, and the electrical Schematics section for tracing wiring. That is exactly what this manual is built around.
Are the line relief and travel crossover relief values included?
Yes. Stick and bucket cylinder line reliefs, head end and rod end, are all 36800 ± 1470 kPa (5350 ± 215 psi) with a 20 ± 2 N·m locknut. Travel crossover reliefs, left and right, forward and reverse, are also 36800 ± 1470 kPa, locknut 130 ± 13 N·m (95 ± 10 lb ft). Pilot relief is 4100 ± 200 kPa (595 ± 29 psi). p. 3157
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