An hour from now you could be up on the ladder checking coolant the way the factory intended, this Komatsu WA320-1 operator manual PDF open beside you: 156 pages Komatsu published as SEAMU4190106 for the WA320-1 wheel loader. The maintenance table anchors the book, scheduling every check from the 50-hour service out to the 4000-hour interval, and troubleshooting guides for engine, chassis, electrical and hydraulic faults decode what the monitor panel's warning lamps are trying to tell you. Operation chapters walk through boom kickout and bucket positioner adjustment, V-shape loading, cold weather starting and towing. Refill the crankcase with 22 liters after an oil change, the transmission case with 25, and plan fuel stops around the 200-liter tank. Guessing at capacities is how transmissions get cooked. Bookmarked, with a live text layer you can search by keyword, it is the shortest route to a loader that runs.
What's Inside This Komatsu WA320-1 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Breaking in Your New Machine | 3 | |
| General Locations and Specifications | 5 | Bucket, Lift Arm, Lift Cylinder |
| Instruments and Controls | 6-31 | Monitor Panel, Meter Group, Warning Lamp, Switches, Levers, Pedals |
| Check Before Starting | 32-36 | Walk-Around Check, Monitor Panel, Coolant, Engine Oil, Fuel Level, Battery Electrolyte |
| Operating Your Machine | 37-45 | Starting the Engine, Moving the Machine, Changing Gear Speed, Changing Direction, Stopping the Machine, Stopping the Engine |
| Adjustment of Work Equipment | 46-47 | Boom Kickout, Bucket Positioner, Bucket Level Indicator |
| Handling the Tires | 49-51 | Tire Handling, Tire Pressure, Deflection Ratio |
| Cold Weather Operation | 53-57 | Fuel and Lubricants, Coolant, Antifreeze, Battery, Starting in Cold Weather |
| Periodic Maintenance | 58 | |
| Bleeding Air From Circuit | 59 | Hydraulic Circuit |
| Periodical Replacement of Safety Parts | 60 | |
| Maintenance Table | 61-63 | Check Before Starting, 50 Hours Service, 100 Hours Service, 250 Hours Service, 500 Hours Service, 1000 Hours Service |
| Oil Filler and Level Gauge Positions | 64-104 | Transmission Case, Hydraulic Tank, Front Axle, Rear Axle, Fuel Tank, Radiator |
| Trouble Shooting Guide | 105-108 | Electrical System, Engine, Chassis, Hydraulic System |
| Service Meter | 109 | Integrated Work Hours, Pilot Lamp |
| Machine and Engine Serial Numbers | 110 | Machine Serial Number, Engine Serial Number |
| Fuel, Coolant and Lubricants | 111-112 | Engine Oil, Diesel Fuel, Coolant, Antifreeze, Grease, Axle Oil |
| Safety and Operation | 113-128 | General Safety, Jobsite Conditions, Starting Engine, Operating Machine, Parking |
| Precautions for Maintenance | 129-135 | General Maintenance, Before Maintenance, During Maintenance, Miscellaneous, Welding Precautions |
| Bucket Operation | 136-141 | Excavation, Leveling, Load and Carry, Loading, V-Shape Loading |
| Operating the Air Conditioner and Car Heater | 142-146 | Air Conditioner Controls, Car Heater Controls, Air Vent Selection, Seasonal Operation |
| Locking Cap, Battery Handling, and Transportation | 147-151 | Fuel Tank Locks, Battery Charging, Starting with Booster Cables, Machine Transportation |
| Storage and Lubricant Specifications | 152-156 | Extended Storage, Post-Storage Procedures, Lubricant Supplier Tables, Coolant Specifications |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Operating Weight | 12800 kg | p. 5 |
| Flywheel Horsepower | 153 HP | p. 5 |
| Fuel Tank Capacity | 200 L | p. 34 |
| Engine Oil Refill Capacity | 22 L | p. 70 |
| Transmission Case Refill Capacity | 25 L | p. 77 |
| Hydraulic Tank Refill Capacity | 75 L | p. 82 |
| Axle Refill Capacity (each) | 24 L | p. 84 |
Komatsu WA320-1 Common Problems This Manual Covers
Komatsu WA320-1 transmission stuck in high gear, sluggish shifting between speed ranges
Check the transmission oil level with the engine at low idle, using the gauge position shown on page 77. Refill capacity is 25 L; add the specified oil if the level reads low. Drain and refill on schedule if the oil looks dark or smells burnt, then recheck shifting through all speed ranges.
Manual Section: Oil Filler and Level Gauge Positions p. 77Bucket lifts slowly or lift arms lack power under a full load
Verify the hydraulic tank oil level with the bucket flat on the ground, at the sight gauge location on page 82. Refill capacity is 75 L; add the specified oil if the level reads low. If the oil looks milky or foams, bleed air from the circuit using the procedure on page 59.
Manual Section: Hydraulic System TroubleshootingEngine temperature gauge climbs into the red zone during long loading cycles
Clean debris and dust from the radiator core and screen. Check coolant level in the radiator during the walk-around inspection on page 32 before each shift. Verify engine oil level as well; refill capacity is 22 L, with the gauge position shown on page 70. Drop to a lower gear if the needle keeps climbing.
Manual Section: Check Before Starting p. 32Engine cranks slowly or refuses to start on cold mornings after sitting overnight
Inspect battery electrolyte level and terminal condition during the walk-around checks on page 32. Use the pre-heating monitor before cranking and follow the cold weather starting steps beginning on page 53. Keep the 200 L fuel tank topped up overnight to limit condensation, and work through the starting motor chart on page 105 if cranking stays weak.
Manual Section: Cold Weather Operation p. 53Growling or whining noise from front or rear axle when turning under load
Check the oil level in both axle cases using the plug positions shown on page 84. Refill capacity is 24 L per axle; top up with the axle oil grade listed in the lubricant tables on page 111 if the level reads low. Drain and refill at the scheduled interval if the noise continues.
Manual Section: Oil Filler and Level Gauge Positions p. 84Frequently Asked Questions
What are the torque specifications for the wheel hub bolts on the Komatsu WA320-1?
The tightening torque for the wheel hub bolts is 94.5 ± 10.5 kgm. Always rotate in the direction of tightening when checking for loose bolts. p. 74
What is the procedure for adjusting the boom kickout on the WA320-1?
To adjust the boom kickout, loosen the two nuts (4) to create a clearance of 3 to 5 mm between the plate (2) and the sensing surface of the proximity switch (3). The tightening torque for these nuts is 1.75 ± 0.25 kgm. p. 46
What is the fuel tank capacity for the Komatsu WA320-1?
The fuel tank capacity for the WA320-1 wheel loader is 200 liters. p. 34
What is the engine oil refill capacity for the WA320-1?
The engine oil refill capacity for the WA320-1 is 22 liters. p. 70
How do I adjust the parking brake on the WA320-1?
If 12 or more ratchets are counted, adjust the parking brake by loosening the lock nut (2) and removing the clevis pin (4). Use the adjustment bolt (7) to set the clearance between the disc and pad to 0.05 - 0.2 mm. p. 102
Will this Komatsu WA320-1 Operator Manual download right away?
Immediate download of the complete 156-page searchable Operator Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this Komatsu WA320-1 manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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