![Caterpillar 924G 924Gz Repair Manual [Wheel Loader] DDA | RBB | WMB | DFZ | RTA | WGX](https://youfixthis.com/wp-content/uploads/2017/01/2017-01-30_11-11-22-300x300.jpg)
![Caterpillar 320C 320C-L 320C-LN 320C-S Repair Manual [Excavator] BBL | BCN | BDE | BEA](https://youfixthis.com/wp-content/uploads/2012/02/Manual_Download-300x300.jpg)
This is the compiled Caterpillar SIS repair set for the 320C and 320CL excavator, and the reason to own it is one page most sellers never mention: Cat prints wear tiers. Swing time, swing time on a slope, overswing and drift all get three numbers - new, rebuild and service limit - so you can test a machine and know exactly where it sits on its life curve. It also prints case drain flow limits for the main pump, swing motor and travel motor, which is how a professional proves internal wear instead of guessing. Coverage runs the Cat 3064 and 3066 engines with the ZEXEL fuel system, full hydraulic testing and adjusting, power train, undercarriage, and hydraulic and electrical schematics with CID/MID/FMI code definitions.
What's Inside This Caterpillar 320C, 320CL (ANB, AMC) Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Air Inlet and Exhaust System | 2-76 | Turbocharger, Inlet and Exhaust Manifolds, Air Cleaner |
| Basic Engine | 77-402 | Cat 3064 and 3066 Engines, Cylinder Head, Crankshaft, Pistons, Flywheel |
| Cooling System | 403-490 | Water Pump, Thermostat, Radiator |
| Electrical and Starting System | 491-1974 | Alternator, Starting System, Batteries, Machine Security System, Product Link, EquipmentManager, Tool Control System, Air Conditioning R134a |
| Engine Arrangement | 1975-2059 | Engine Mounting and Arrangement |
| Frame and Body | 2060-2153 | Frame, Body Panels |
| Fuel System | 2154-2501 | Zexel Fuel System, Injection Pump, Injectors, Priming |
| Hydraulic System | 2502-4789 | Main Relief Valve Test and Adjust, Line Relief Valve Test and Adjust, Pilot Relief and Accumulator, Swing Relief, Crossover Relief, Cylinder Drift Checks, Case Drain Flow Tests, Boom and Stick Drift Reduction Valves, Power Shift |
| Implements | 4790-4896 | Boom, Stick, Bucket Linkage |
| Lubrication System | 4897-4969 | Engine Oil Pump, Oil Filter |
| Machine Arrangement | 4970-4982 | Machine Arrangement and Layout |
| Operator Station | 4983-5857 | Cab, Controls, Monitor, Air Conditioning |
| Power Train | 5858-5953 | Travel Motor, Swing Motor, Final Drives |
| Service Equipment and Supplies | 5954-6009 | Service Tooling and Supplies |
| Undercarriage | 6010-6076 | Track, Idlers, Rollers, Track Tension |
| Work Tools | 6077-6096 | Work Tool Hydraulics and Mounting |
| Torque Specifications | 6097-6146 | Metric ISO Fasteners, English SAE Fasteners, Fittings, Plugs, Hose Clamps |
| Schematics | 6147-6233 | Machine Hydraulic Schematics, Standard Electrical, Machine Harness Connector and Component Locations, CID MID FMI, Graphic Symbol Legends |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| new / rebuild / service limit | ||
| Swing time, right and left | 4.2 / 4.6 / 5.2 s or less | |
| Swing time on a slope | 5.2 / 5.7 / 6.5 s or less | |
| Overswing | 1100 / 1200 / 1400 mm (43.3 / 47.2 / 55.1 in) or less | |
| new, rebuild and service limit | ||
| Machine drift and swing drift on a slope | 0 mm | |
| All Models | ||
| Main relief valve setting | 34300 +/- 490 kPa (4950 +/- 72 psi) | |
| Pilot relief valve setting | 4100 +/- 200 kPa (595 +/- 29 psi) | |
| Main pump maximum acceptable case drain flow | 17.3 L/min (4.57 US gpm), 26.0 L/min (6.87 US gpm) at the second condition | |
| Swing motor maximum acceptable case drain flow | 30 L/min (7.9 US gpm) and 35 L/min (9.2 US gpm) | |
| Travel motor maximum acceptable case drain flow | 15 L/min (4.0 US gpm) and 18 L/min (4.78 US gpm) | |
| Cylinder operating speed, boom extension | 2.8 +/- 0.5 seconds | |
| Test conditions | hydraulic oil 55 +/- 5 C (131 +/- 9 F), bucket load 1050 kg (2310 lb) | |
| Pilot accumulator charge at 20 C | 1760 kPa (255 psi) | |
| Engines fitted | Caterpillar 3064 and 3066 | |
| boom, stick and bucket cylinders | ||
| Line relief valve setting | 36800 +/- 1470 kPa (5350 +/- 215 psi) | |
Caterpillar 320C, 320CL (ANB, AMC) Common Problems This Manual Covers
Slow swing or weak boom, whole machine feels tired
Run the timed performance checks against the printed wear tiers (swing 4.2 / 4.6 / 5.2 s), then verify main relief at 34300 kPa. If reliefs are on spec, the case drain flow tests separate pump wear from motor wear without teardown.
Manual Section: Hydraulic System - Testing and Adjusting p. 2835Bucket or boom sinks when the machine sits parked
Follow the cylinder drift check procedure to measure the rate, then work through the drift reduction valve and control valve tests to isolate whether the leak path is cylinder piston seals, a line relief valve, or the drift reduction valve itself.
Manual Section: Hydraulic System - Cylinder Drift Checks and Drift Reduction Valves p. 2891Suspected pump or travel motor wear, but no proof
The case drain flow tests give hard pass/fail numbers: main pump limits of 17.3 and 26.0 L/min depending on test condition, swing motor 30/35 L/min, travel motor 15/18 L/min. Flow above those limits is documented internal leakage, not opinion.
Manual Section: Hydraulic System - Case Drain Flow Tests p. 2502Hard starting or low engine power
The Fuel System section covers the ZEXEL injection pump and injectors, including checks for air in the fuel, which is a common cause on these machines. Cross-check against the Basic Engine section for compression-related causes on the 3064 and 3066 before pulling the pump.
Manual Section: Fuel System - ZEXEL Injection Pump and Injectors p. 2154Frequently Asked Questions
My 320C feels slow and tired. How do I tell if it is actually worn out?
This is exactly what the wear tiers answer. Warm the oil to 55 C, load the bucket to 1050 kg per the test conditions, then time a full swing: 4.2 seconds or less is new condition, 4.6 is rebuild spec, and 5.2 is the service limit. Same tiered numbers exist for swing on a slope (5.2 / 5.7 / 6.5 s) and overswing (1100 / 1200 / 1400 mm). If your machine blows past the service limit, the manual walks you to relief valve checks and case drain flow tests to find whether it is the pump, a motor, or a drifted relief setting.
What should the main relief valve be set to on a 320C?
34300 +/- 490 kPa, which is 4950 +/- 72 psi. Line reliefs for boom, stick and bucket are higher at 36800 +/- 1470 kPa (5350 +/- 215 psi), and pilot relief is 4100 +/- 200 kPa (595 +/- 29 psi). The Testing and Adjusting section gives the full procedure for each: where to tee in the gauge, engine speed, oil temperature, and how to adjust. A relief that has drifted low is the cheapest fix for a weak machine, so check it before condemning the pump.
Does this manual cover my serial number?
It covers 16 serial prefixes printed in the book: AMC1-Up, ANB1-Up, BBC1-Up, BBL1-Up, BCN1-Up, BDC1-Up, BDE1-Up, BEA1-Up, BEF1-Up, BER1-Up, BGB1-Up, BKK1-Up, BPR1-Up, BRX1-Up, CLM1-Up and CLZ1-Up. That is much broader than the two prefixes older listings quoted. Check the first three characters of your PIN plate against that list.
The boom or bucket drifts down when parked. How do I diagnose that?
The hydraulic Testing and Adjusting section has dedicated cylinder drift checks with acceptable limits, plus procedures for the boom and stick drift reduction valves that hold the load when the lever is centered. The sequence matters: measure drift first, then isolate whether oil is escaping past the cylinder piston seals, through the line relief, or through the drift reduction valve. Note that machine drift and swing drift on a slope have a spec of zero at every wear tier, so any visible movement there means something is leaking.
Which engine is in the 320C, and does the manual cover the fuel system?
These machines run the Caterpillar 3064 or 3066, and the manual covers both, from cylinder head and crankshaft down to pistons. The fuel side is the ZEXEL system with its injection pump and injectors, covered in its own Fuel System section. The 320C is also an electronic machine: it has an ECM and Cat's CID/MID/FMI diagnostic code structure, and the schematics volume includes the standard electrical schematic, harness connector locations, and the code definitions, plus coverage of Machine Security System, Product Link and Tool Control options.
