Caterpillarexcavator

Caterpillar 313C SR

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 313C SR is a short-radius (reduced tail-swing) crawler hydraulic excavator in Cat's compact-to-midi excavator lineup, sized for confined worksites. Built in Japan on WSA-prefix serial numbers, it was produced roughly 2003 to 2007 as part of the 313C generation, sitting between the smaller 312-series machines and the mid-size 315/320 line. Power comes from the Cat 3064T turbocharged diesel, mechanically fuel-injected with no electronic engine controls, rated at roughly 67 to 70 kW (90 to 95 hp) gross depending on the rating standard used. Operating weight runs roughly 13 to 14.5 metric tons (about 28,700 to 32,000 lb), varying with the boom, stick, counterweight, and undercarriage fitted. The 313C series was offered in SR, CR (compact-radius), and standard-boom configurations; the SR variant adds a side-shift boom and shorter tail swing for tight-quarters digging. It followed the Cat 313B, which was also offered in SR form, and was eventually succeeded by the 313D generation as Caterpillar moved to tighter-emissions engines.

Within the 313C SR run, machines differ mainly in boom and stick length, counterweight, and the undercarriage shoe width chosen for the destination market, which shifts operating weight and reach figures. Treat published numbers as ranges and confirm against the machine's own rating plate rather than a generic spec sheet. Because the 313C SR predates DPF- and DEF-era emissions rules, it stays mechanically simple to service, which keeps demand steady in the used and grey-import market, especially units re-exported out of Japan with comparatively low recorded hours. Its short tail swing still suits roadwork, utility, and residential digging where a full-swing machine will not fit, and its shared 3064T engine and pilot-hydraulic architecture with the 311B, 312B, and 312C family keeps parts and rebuild kits comparatively easy to source even though the model itself has been out of production for years.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar 313C SR specifications

Engine

Engine model	Cat 3064 (E-3T), four-cycle, water-cooled, direct-injection, turbocharged diesel
Rated (net) output	59 kW (80 PS / 79 hp) at 1,800 rpm
Displacement	4.25 L (259 cu in)
Cylinders	4, inline, turbocharged, bore 102 mm x stroke 130 mm (4.02 in x 5.12 in)
Emissions / noise certification	Certified to Japan's second-phase off-road exhaust emission standard; also carries Japan's low-noise construction-machinery certification

Weights

Operating weight - standard boom (PMZ-T5)	14,000 kg (30,900 lb)
Operating weight - offset boom (PMZ-R5)	14,100 kg (31,100 lb)
Operating weight - shovel-crane spec (PMZ-T5SC)	14,200 kg (31,300 lb)
Ground pressure	About 45 kPa (6.5 psi) on the standard-boom machine; about 46 kPa (6.7 psi) on the offset-boom and shovel-crane variants, on 500 mm shoes

Dimensions

Overall transport length	About 7.48 m (24 ft 6 in), standard boom, arm and bucket fitted
Overall width	About 2.49 m (8 ft 2 in)
Overall height (cab roof)	About 2.82 m (9 ft 3 in) on the standard-boom machine; up to about 2.86 m on the offset-boom variant
Undercarriage (track frame) length	3,490 mm (11 ft 5 in), long-frame undercarriage fitted to this model for stability
Tail swing radius	1,420 mm (4 ft 8 in)
Front (minimum) swing radius	1,380 mm (4 ft 6 in), with the 2.13 m arm
Full swing-circle diameter	2,840 mm (9 ft 4 in) - this is the ultra-short/true short-radius swing footprint the SR designation refers to
Track shoe width	500 mm (20 in) standard triple-grouser; 600 mm and 700 mm shoes offered
Dozer blade width	2,500 mm (8 ft 2 in), bolt-on cutting edge

Performance

Max dig depth	About 4.84 m (15 ft 11 in) with standard boom and 2.13 m arm; varies by configuration, roughly 4.6-4.84 m across the offset-boom and shovel-crane variants
Max reach at ground level	About 7.39 m (24 ft 3 in) standard boom; roughly 7.0-7.4 m across configurations
Max dig / cutting height	About 8.47 m (27 ft 9 in), standard boom
Max dump height	About 6.06 m (19 ft 11 in), standard boom
Swing speed	11.6 rpm in normal digging mode; reduced to about 5.5 rpm in shovel-crane lifting mode for safe load handling
Travel speed	5.2 km/h (3.2 mph) high range; 3.6 km/h (2.2 mph) low range
Gradeability	70% (35 degrees)
Max boom-offset travel	950 mm (3 ft 1 in) left; 1,300 mm (4 ft 3 in) right, offset-boom variant
Shovel-crane lift capacity	Up to 2.9 t, on the factory shovel-crane spec machine with load-moment limiter
Shovel-crane max lift height	About 5.61 m (18 ft 5 in)

Forces

Bucket digging force	88 kN (19,800 lbf / 9.0 tonne-force)
Stick (arm) digging force	63 kN (14,200 lbf / 6.4 tonne-force), with the 2.13 m arm

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

313C SR fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	17.5 L (4.6 US gal)	Cat DEO (Diesel Engine Oil) 15W-40 for temperate to warm climates, meeting Cat ECF-1 and API CI-4/CH-4 or higher. Cat DEO 10W-30 recommended in cold climates for easier starting.
Cooling system	17.5 L (4.6 US gal), including a 1.5 L reserve tank	Cat ELC (Extended Life Coolant), factory premix or 50/50 concentrate-to-water mix. Cat DEAC (Diesel Engine Antifreeze/Coolant) is the conventional alternative where ELC is not used.
Fuel tank	200 L (52.8 US gal)	No. 2-D ultra-low-sulfur diesel fuel for normal operation. No. 1-D diesel recommended in cold weather to reduce gelling and improve cold starting.
Hydraulic system (tank)	120 L (31.7 US gal)	Same selection as the hydraulic system total: Cat HYDO Advanced by climate (10W cold / 30W warm), with Cat TDTO as an alternate.
Final drive (each)	not confirmed for this exact configuration from available sources - verify against the OMM or with a dealer before servicing	Cat TDTO (Transmission/Drive Train Oil), SAE 30 for normal ambient ranges, TDTO 50 in hot climates. Factory service literature for this excavator also calls for a light coat of 10W TDTO to pre-lube drive-train seal faces during assembly.
Swing drive	not confirmed for this exact configuration from available sources - verify against the OMM or with a dealer before servicing	Cat TDTO, same grade selection as the final drives by ambient temperature (10W-30W range).
Pilot/other circuits	no separate fill point documented for this excavator class	The pilot hydraulic circuit draws from the main hydraulic system reservoir; no separate pilot fluid or capacity is specified in available literature.
Grease (chassis pins and bushings)	n/a - spec only	Cat Multipurpose Grease (Cat MPGM), NLGI Grade 2 lithium-complex, for general pin and bushing lubrication. Cat Extreme Application (XA) grease is the recommended alternative for high-load, high-temperature, or wet operating conditions.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar 313C SR maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and top off before starting. Check coolant level in the overflow/recovery tank. Drain water and sediment from the fuel/water separator. Inspect tracks, rollers, idlers, and sprockets for wear, damage, or looseness. Walk around the machine and check for hydraulic, fuel, and oil leaks and loose fasteners. Grease boom, stick, and bucket linkage pins.
Every 250 h	Change engine oil and replace the oil filter. Replace the fuel filter element. Check swing drive and final drive oil levels. Inspect and clean or replace the air filter primary element. Check alternator and fan belt tension and condition.
Every 500 h	Replace the hydraulic system return/case-drain filter element. Take an engine oil sample for lab analysis. Change the final drive (travel motor) gear oil. Change the swing drive gear oil. Inspect the turbocharger for shaft play, oil leaks, and boost hose condition.
Every 1,000 h	Replace the hydraulic tank breather/filler cap element. Check and adjust engine valve lash. Inspect fuel injection pump timing and injector spray pattern. Inspect track chain wear and check pin/bushing turn eligibility. Check swing bearing bolt torque and swing gear backlash.
Every 2,000 h	Change the hydraulic tank oil and clean the tank strainer. Test coolant condition and replace if outside specification. Inspect the water pump for bearing play and seal leakage. Check turbocharger boost pressure and wastegate operation. Run a full undercarriage wear inspection covering chain pitch, roller and idler wear, and sprocket tooth wear. Inspect engine and cab mounts for cracking or wear.
Every 4,000 h	Bench-test or rebuild the fuel injection pump and injectors. Overhaul or replace worn track chain, rollers, idlers, and sprockets at wear limits. Inspect and reseal the main hydraulic pump and cylinder rod seals. Perform an engine inframe inspection of liners, bearings, and rings if oil consumption or blow-by has increased. Inspect the swing bearing and swing drive gear set for wear and replace as needed.

Servicing the 313C SR beyond the schedule

Predictive Maintenance & Fluid Analysis

Pull engine oil samples at every oil change to catch turbocharger or injection-pump wear early. The mechanical 3064T has no ECM to flag problems, so lab data is the main warning system. Sample hydraulic oil and coolant on the same interval. Pilot-hydraulic valves and the swing and travel gear pumps are sensitive to particulate and moisture contamination. Log undercarriage wear (chain pitch, sprocket teeth, roller flats) on a set schedule. Worn track quietly cuts swing and travel efficiency before it becomes obvious.

Corrective & Common Repairs

Expect undercarriage wear as the first major repair on a used 313C SR. Japanese-import units often carry hard site hours, so chain, rollers, and idlers are common replacement points. Pilot-hydraulic control valves can stick or leak at the joystick and pedal linkages; rebuild kits are shared with the 312C-era compact excavators. On the 3064T, watch for turbocharger shaft play and injection-pump leaks. The mechanical fuel system has no self-diagnostics to warn of a failing plunger or worn nozzle.

Overhaul & Rebuild Points

Plan a hydraulic pump and cylinder reseal once seal drift and cycle-time loss show up. The 313C SR's pilot-operated pumps and rod seals wear predictably on a machine this age. Final drives and the swing gearbox are the other common rebuild points; both run gear-oil-lubricated planetary sets shared across the 313 family. On the engine side, a 3064T inframe overhaul (liners, bearings, injection pump) is the standard fix once oil consumption or smoke signals worn rings rather than a simple turbo or injector repair.

Seasonal & Environment Servicing

Cold-weather starts on the mechanical 3064T rely on glow plugs and correct coolant mix rather than any ECM-controlled cold-start strategy. Verify the coolant's freeze protection and battery condition before winter. Switch to a winter-grade fuel to prevent gelling in the mechanical injection pump and lines. In hot, dusty conditions, shorten air filter and radiator/oil cooler cleaning intervals and check track tension more often, since imported units often move between very different climates from their Japanese service history to the buyer's site.

313C SR fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Engine coolant temperature warning lamp (red icon, thermometer symbol)	Engine coolant temperature has risen above the normal operating range.	Low coolant level, blocked or dirty radiator core, slipping or broken fan belt, stuck thermostat, or a faulty coolant temperature switch/sender.	Reduce load and let the engine idle rather than shutting down at once. Once safe, check coolant level and radiator fins and inspect the fan belt/drive. Let the system cool before opening the cap.
Engine oil pressure warning lamp (red icon, oil-can symbol)	Engine oil pressure has dropped below the safe minimum sensed at the oil pressure switch.	Low engine oil level, worn oil pump, clogged oil filter, an oil leak, or a faulty oil pressure switch/sender.	Stop the engine immediately. Check oil level and look for external leaks before restarting; do not continue running with this lamp lit.
Charging system (alternator) warning lamp (battery icon)	Alternator is not charging the battery at a normal rate.	Loose or broken alternator belt, worn brushes or a failing alternator, loose/corroded wiring connections, or a weak battery.	Check belt tension and condition, inspect wiring and connections at the alternator and battery, and test alternator output; repair or replace as needed.
Hydraulic oil temperature warning lamp (red icon, thermometer over hydraulic symbol)	Hydraulic tank oil temperature has exceeded the normal operating range.	Low hydraulic fluid level, a clogged oil cooler, sustained high-load operation, or a relief valve stuck open causing continuous heat buildup.	Reduce hydraulic load and let the machine idle to cool. Once safe, check fluid level and clear debris from the oil cooler fins.
Air filter restriction indicator	Air cleaner element is restricted beyond the allowable limit.	Dirty or clogged primary air filter element, or a damaged element letting unfiltered air bypass and trip the restriction switch.	Inspect the air filter element; clean or replace it and confirm the restriction indicator resets after service.
Fuel level low warning lamp	Fuel level in the tank has dropped to the reserve level.	Normal fuel consumption nearing empty, or a faulty fuel gauge sender if the lamp does not match the visible tank level.	Refuel as soon as practical. If the engine also runs rough after refueling, check for water or contamination in the tank.
Central action/alarm lamp with audible buzzer	General attention indicator that lights together with a specific warning icon (coolant temperature, oil pressure, charging, hydraulic temperature, filter restriction) to flag an abnormal condition.	Follows whichever specific system warning has tripped; if it comes on alone with no other icon lit, points to a monitor panel or wiring fault.	Identify which specific icon is lit alongside it and follow that item's action. If it flashes with no other icon on, check the monitor panel wiring and connections.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

313C SR attachments & work tools

Buckets

The 313C SR sits in the 12-15 metric ton excavator class, and its factory-fit bucket runs close to 0.5-0.6 m³ at roughly 900 mm (36 in) width. Across general-duty, heavy-duty, and severe-duty/rock buckets sized for this class, capacity typically spans about 0.3 m³ up to roughly 0.6-0.8 m³, with working widths from around 450 mm (18 in) up to 900 to 1,050 mm (36-42 in) depending on duty rating and dig material; exact range varies by configuration and bucket-linkage generation. Standard bucket mount on this generation is pin-on; a hydraulic quick coupler is an available option rather than the base fit.

Hydraulic hammers

This machine matches Cat's mid-size hammer line for the 10-15 (metric) ton carrier class, historically cataloged around the H100 class breaker. A hammer sized to this carrier typically runs a service/working weight near 950 kg to about 1.1 tonne with an impact-energy class in roughly the 1,700-2,000 J range. Breaker oil flow and relief pressure must be matched to the excavator's high-pressure auxiliary (hammer) circuit; going above this weight class stresses the boom and stick, going below it wastes available flow.

Quick couplers

Cat's Pin Grabber-style hydraulic coupler (manual or hydraulic-actuated) is the OEM coupler line sized for this excavator range, letting the operator swap pin-on buckets and work tools from the cab. Compatibility is set by pin spacing and diameter for this stick/bucket size rather than by machine model name alone, so pin dimensions should be confirmed against the specific unit before ordering. Aftermarket pin-grab and wedge/hook-style couplers sized for the 12-15 ton class are also commonly fitted.

Thumbs/grapples

Pin-on hydraulic thumbs built for the 311-314 size class (roughly 12-15 ton) bolt or weld to the stick and share the factory bucket pivot pin; typical thumb width for this class runs around 600-700 mm (24-26 in). Rotating (360°) demolition or sorting grapples built for the 12-16 ton class are also run on this machine, with grapple rotation on the medium-pressure/proportional circuit and jaw clamp on the high-pressure circuit.

Rippers

A single-shank ripper is the typical ripper fit for this size class, pin-mounted to the stick in place of the bucket for breaking frost or ripping light rock and asphalt. Cat does not catalog a dedicated multi-shank ripper for this excavator size; single-shank pin-on rippers for the 313C SR come from aftermarket attachment makers sized to the 12-15 ton class.

Hydraulic-kit notes

Work-tool plumbing on this machine splits into a high-pressure auxiliary line for impact and clamping tools (hammers, compactors, grapple jaws) and a separate medium-pressure, proportional-flow line for continuously-actuated tools such as tilting buckets or rotating grapples. Attachment flow and pressure ratings must be matched to whichever circuit the tool runs on; operating a tool outside its rated flow/pressure window is the most common cause of premature wear on both the tool and the machine's hydraulic pump.

All 313C SR assemblies by section

Every catalogued assembly group for the Caterpillar 313C SR. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Machine Arrangement

0j-0000 Chart-Commonality

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Chart-Commonality

See all parts with full part numbers in Heavy Parts AI →

313C SR serial number reference

On this generation of Cat mini/midi crawler excavator the PIN/serial plate is riveted to the right side of the machine frame near the base of the cab, visible from ground level below the cab window; the number is also stamped directly into the frame itself as a backup if the plate is lost. The PIN reads as a 3-letter prefix that identifies the model/build series, followed by a sequential unit number (e.g. WSA00001), with the parts catalog listing the whole production block as "WSA1-UP."

Prefix	Identifies	Notes
WSA	313C SR short-radius crawler excavator (standard/only documented configuration)	Only PIN prefix documented for the 313C SR track-type excavator. Japan-built machine (Shin Caterpillar Mitsubishi / later Caterpillar Japan joint-venture production), fitted with the Cat 3064T engine (Mitsubishi S4K-T based; engine serial prefix 6LK on WSA-chassis units). Used-equipment listings place production roughly 2003-2007; treat the exact start/end year as approximate, confirm with dealer for a specific unit.

Frequently asked questions

What engine does the Caterpillar 313C SR use?

It runs the Cat 3064T, a turbocharged diesel with a fully mechanical fuel-injection system and no electronic engine controls, rated at roughly 67 to 70 kW (90 to 95 hp) gross depending on the rating standard used. The same engine powers the related 311B, 312B, and 312C compact excavators.

What is the operating weight of the Caterpillar 313C SR?

Operating weight runs roughly 13 to 14.5 metric tons (about 28,700 to 32,000 lb), depending on the boom and stick length, counterweight, and undercarriage shoe width fitted. Check the rating plate on the specific machine for its exact figure.

What replaced the Caterpillar 313C SR?

Caterpillar moved this line to the 313D generation, offered in CR, SR, and other boom configurations, as part of the shift to tighter-emissions engines. The 313C SR itself had succeeded the earlier 313B SR in the same short-radius line.

What 313C SR owners discuss

What engine does the Cat 313C SR run, and how does it behave day to day?

The 313C SR uses a Cat 3064T turbocharged diesel, an inline four-cylinder engine in the roughly 4.4 L displacement class. It is the same base engine family fitted across the wider 311C-314C lineup, tuned to different power levels model to model. Reported behavior in daily use is a strong, torquey unit for the machine's weight class with no unusual running characteristics once warmed up: normal cold-start smoke that clears quickly, a steady idle, and no flat spots under load when the fuel system and turbo are in good condition.

All hydraulic functions on my 313C SR went dead at once but the engine still runs fine. What should I check first?

Suspect the pilot hydraulic lockout circuit before the main pump. Every hydraulic function on this platform routes pilot oil through a lockout lever and solenoid near the seat. If that solenoid coil fails, the lever's safety switch loses continuity, or the wiring corrodes, pilot pressure never reaches the control valves and swing, travel, boom, and stick all go dead together while the engine keeps idling normally. Check solenoid coil resistance and listen for a click when the lever is cycled before tearing into the main pump or valve bank. Have your dealer verify the lockout circuit and wiring before authorizing pump or valve repair.

What undercarriage wear pattern is typical for a machine this size?

At this roughly 13-tonne class, owners commonly report getting noticeably more life out of the sprockets, idlers, and rollers than out of the track chain itself, provided tension is kept in spec. Digging toward the idler end rather than pulling load back toward the sprocket cuts drivetrain wear. Abrasive or sandy ground and sustained high travel speeds accelerate sprocket tooth wear faster than typical digging duty. Track sag needs rechecking on a routine schedule: running loose accelerates pin, bushing, and roller wear, while running too tight speeds up bushing and sprocket wear.

Does the 313C SR's engine share quirks with its 311C/312C/314C siblings, or is it its own animal?

The 3054/3064 engine family spans the whole 311C through 314C lineup at different power ratings, roughly from the low-60s kW (low-80s hp) on the smaller models up to around 70 kW (mid-90s hp) on the larger ones. Published figures for the 313C SR itself vary by source, so confirm the exact rating off the engine dataplate rather than a spec sheet; it varies by configuration. One quirk shared across the whole engine family: injection pump timing has to be reset to the factory alignment marks at TDC after pump or timing-cover service. Get that wrong and the result is hard starting, white smoke, or a rough idle that looks like a fuel-quality problem instead of a timing problem.

How strict does hydraulic fluid and filter maintenance need to be on this machine?

Very strict. This class of excavator runs high system pressure to generate its breakout force, so even a small amount of contamination can wreck a pump or seize a control-valve section. Owners and techs recommend not stretching filter change intervals when working in dusty or wet conditions, and treating metal or fine debris found in a cut-open filter as an early warning of pump wear, not routine buildup. Running the machine on a clogged or bypassed filter sends unfiltered oil through the whole system and multiplies the damage quickly.

What should I check before buying a used Cat 313C SR?

This is a Japan-domestic model that shows up elsewhere as a grey-market machine, so start with the paperwork. Confirm the machine and engine serial numbers are consistent with a genuine 313C SR build, since mismatched plates and altered hour meters do turn up on grey-market listings. Confirm the actual boom configuration on the machine in front of you. Cat's own catalog labels this the Short Radius configuration, but owners describe a practical difference from the CR sibling in boom offset capability, and documentation does not always spell this out clearly. Cycle the hydraulic lockout lever and confirm every function responds cleanly with no delay or dead spots. Check for stored boom and dipper sensor faults. Walk the full undercarriage for sprocket, idler, and roller wear, and check track tension. Because documentation for Japan-spec machines can be scarce or Japanese-only outside that market, have your dealer verify serial authenticity and parts-book match before you commit.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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