Komatsu PC300 Parts India —
Hydraulic Pump, Filter Kit, Engine Parts

The PC300 — India's Workhorse Heavy Excavator

The Komatsu PC300 occupies a critical position in India's construction and mining equipment landscape. Where the PC200 serves mid-size contractors and rental fleets, the PC300 is the machine that serious operators reach for when productivity matters more than daily rental cost — infrastructure contractors building highways and dams, quarry operators running multi-shift extraction, and mining companies moving large material volumes where a PC200 simply doesn't have the reach or bucket capacity to compete.

India's PC300 installed base spans three major operating generations — the PC300-6, PC300-7, and PC300-8 — with the PC300-7 and PC300-8 forming the backbone of active fleets. The PC300LC (long undercarriage) variant is particularly common in Indian quarrying and deep excavation applications, where ground pressure and machine stability in soft or unstable ground are critical. Many of these machines have crossed 12,000 and 15,000 hours and are on their second engine rebuild and third undercarriage set.

At Parts Trading Company, the PC300 series is one of our highest-demand Komatsu lines. We have been supplying hydraulic pumps, SAA6D114E engine parts, filter kits, and undercarriage components for these machines since the PC300-7 first entered India in significant numbers in the early 2000s. This guide covers everything you need to identify, source, and install the right part for the right generation.

PC300 Generation Guide — What Changed Between -6, -7, and -8

The PC300 model number encompasses three distinct engineering generations with different engines, different hydraulic architectures, and different electronic systems. Ordering parts without confirming the generation is the single most common — and most expensive — mistake in PC300 parts procurement.

Komatsu PC300-6 (1993–2000) — Serial Range: A11001~

The PC300-6 was the machine that established the PC300's reputation in Indian construction. It uses the SAA6D108E-2 engine — a 6.5-litre six-cylinder turbocharged unit producing approximately 160 kW (215 hp). The -6 generation uses a mechanical injection system without common-rail electronics, making it serviceable in locations where Komatsu diagnostic tools are not available. The hydraulic pump on the PC300-6 is the Kawasaki K3V180DT platform — a large-displacement tandem variable-displacement axial-piston pump, physically larger than the PC200's K3V112 family.

The PC300-6 has no integrated electronic control for the hydraulic pump. The monitor panel is straightforward: temperature, fuel, and charge warning indicators. No fault code display, no KOMTRAX. This simplicity makes -6 machines highly maintainable at independent workshops across India, and the machine is still working productively in quarrying and earthmoving fleets that have maintained it carefully.

Parts availability for the -6's SAA6D108E-2 engine has declined compared to the -7 and -8 generations. Procure critical seals and gaskets when they are available rather than waiting for a breakdown.

Komatsu PC300-7 (2000–2007) — Serial Range: B30001~

The PC300-7 is a fundamentally redesigned machine compared to the -6. It introduced the SAA6D114E-3 engine — a 8.3-litre six-cylinder turbocharged unit producing 170 kW (228 hp). This is one of the most widely used engine platforms in the heavy equipment industry, shared across multiple Komatsu excavator, dump truck, and wheel loader models, which means aftermarket parts support is excellent and will remain so for years to come.

The PC300-7 also introduced Komatsu's CLSS (Closed-centre Load Sensing System) hydraulic architecture to the 30-tonne class. The CLSS system delivers hydraulic flow proportional to demand rather than at a fixed rate, dramatically reducing heat generation and improving cycle times. The main pump is the Kawasaki K3V180DTP — mechanically similar to the -6's pump but with the new CLSS regulator and port plate. Later PC300-7 serial numbers include Komatsu's KOMTRAX telematics system.

Komatsu PC300-8 (2007–2018) — Serial Range: C20001~

The PC300-8 is the most common generation in active Indian fleets today. It uses the SAA6D114E-3 engine in its Tier 3 / Stage IIIA emissions configuration, producing 177 kW (237 hp) — a 4% power increase over the -7 achieved primarily through improved turbocharger mapping. The fuel system remains mechanically injected (not common-rail), which is a significant advantage in the Indian context: no high-pressure injector failures, no injector cleaning requirements, and no fuel cleanliness specifications that the Indian market struggles to meet consistently.

The PC300-8 introduced refined CLSS hydraulics with improved pump response curves, a significantly upgraded monitor panel with fault code display, and ECO guidance feedback. The cab design was substantially revised for operator comfort, and KOMTRAX became standard equipment. The -8 generation also introduced the PC300LC-8 (long undercarriage) as a distinct catalogued variant rather than an option — reflecting the popularity of this configuration in Indian quarry applications.

Filter Kit — Protecting the SAA6D114E Engine

The SAA6D114E-3 engine in the PC300-7 and -8 is mechanically robust and responds well to correct maintenance. Its primary vulnerability in the Indian operating environment is the cooling system — the large 8.3-litre engine generates significant heat, and a restricted or neglected radiator, combined with inadequate coolant quality, is the most common cause of serious engine damage in PC300 fleets.

A properly executed filter service at 500-hour intervals — covering the engine oil, fuel, and air systems simultaneously — is the most effective maintenance investment available to any PC300 operator.

PC300-7 / PC300-8 Filter Kit (SAA6D114E-3)

Filter	Komatsu Part Number	Change Interval	Notes
Engine oil filter	600-211-1231	Every 500 hours	Cartridge type; check oil level every 50 hours
Fuel pre-filter (water separator)	600-319-3610	Every 500 hours	Drain water bowl every 250 hours or after refuelling in rain
Fuel filter (secondary)	600-311-9121	Every 500 hours	Change together with pre-filter; do not reuse
Air filter (outer element)	600-185-6120	Every 1,000 hours or on condition	Inspect restriction indicator at 250 hrs; blow out (don't wash) at 500 hrs
Air filter (inner/safety element)	600-185-6130	Every 3,000 hours or if outer breached	Never attempt to clean or reuse safety element
Hydraulic return filter	207-60-71182	Every 1,000 hours (first change at 250 hrs on new machine)	Element replacement only; check bypass indicator before changing
Hydraulic pilot filter	20Y-62-51680	Every 1,000 hours	Blocked pilot filter causes slow/sluggish machine response across all functions
Swing reduction oil	N/A — oil change only	Every 2,000 hours	SAE 90 gear oil; check level every 500 hrs
Final drive (travel) oil	N/A — oil change only	Every 2,000 hours	Check for metal particles in drain plug magnet at each change

Hydraulic System — Main Pump, Oil Cooler, Cylinder Seals

The PC300's CLSS hydraulic system is, when properly maintained, one of the most efficient and responsive in the 30-tonne excavator class. The load-sensing architecture ensures that the machine delivers exactly the flow demanded by each function — no more — which reduces heat generation and extends the life of hydraulic seals and hose assemblies. But when the hydraulic system develops problems, the CLSS architecture means that faults can present in unexpected ways, requiring systematic diagnosis rather than component swapping.

Main Hydraulic Pump — 708-2H Series

The PC300-7 and PC300-8 use the Kawasaki 708-2H series main hydraulic pump — a large tandem variable-displacement axial-piston pump with approximately 180 cc/rev displacement per section. The pump includes an integrated charge pump (gear type) that supplies the pilot circuit pressure (3.4–3.9 MPa on PC300-8) and a servo control mechanism that responds to the CLSS load-sensing signal from the control valves.

The 708-2H-00181 Komatsu Hydraulic Main Pump is available from our Mumbai stock for same-day dispatch. Always confirm the exact variant (708-2H-00181, 708-2H-00191, or 708-2H-00450) against your machine serial number before ordering — small differences in the port configuration and regulator settings make these variants non-interchangeable despite physical similarities.

Pump failure presents as: low hydraulic power, slow machine response, high hydraulic oil temperature, or total loss of one or more functions. Before condemning the pump, diagnose:

• Pilot filter condition — a blocked pilot filter at 20Y-62-51680 mimics pump failure completely
• Case drain flow — measure with a flow meter on the case drain line; excessive flow (more than 15–20 L/min at normal operating temperature) confirms internal pump wear
• Pilot relief pressure — should be 3.4–3.9 MPa; low pilot pressure prevents full pump displacement from being commanded
• Hydraulic oil condition — milky oil indicates water contamination; dark or burnt-smelling oil indicates overheating-related seal degradation throughout the circuit

Oil Cooler and Radiator

The PC300-8's large engine and heavy-duty hydraulic circuit generate substantial heat. In Indian operating conditions — sustained heavy digging cycles in ambient temperatures of 40–48°C — oil cooler and radiator performance is a critical constraint. A partially blocked oil cooler will cause hydraulic oil temperatures to climb above 90°C, accelerating seal degradation throughout the circuit and eventually causing pump and motor failures that cost far more to repair than a cooler replacement.

The 207-03-51121 Komatsu Oil Cooler and 207-03-75121 Komatsu Radiator Assembly are available from our stock for the PC300-7 and -8. Clean the oil cooler fins with low-pressure compressed air or water at every 500-hour service — fin blockage from dust and debris is the most common cause of overheating on Indian job sites, and it is entirely preventable.

Cylinder Seal Kits for PC300

The PC300's three working cylinders (boom, arm/stick, and bucket) are significantly larger than a PC200's — the increased bore and rod dimensions mean higher seal contact pressures and higher replacement costs. Quality aftermarket seal kits are perfectly acceptable for field reconditioning; the seal material specification (NBR for standard temperatures, FKM/Viton for sustained high-temperature applications) matters more than the brand name on the packaging.

Cylinder	PC300-8 Bore / Rod (approx.)	What's in the Kit	Recommendation
Boom cylinder	155 mm bore / 110 mm rod	Piston seals, rod seal, wiper ring, backup rings, O-rings	Quality aftermarket acceptable
Arm (stick) cylinder	140 mm bore / 100 mm rod	Full seal kit	Quality aftermarket acceptable
Bucket cylinder	130 mm bore / 90 mm rod	Full seal kit	Quality aftermarket acceptable

The 20G-63-K1410K PC300-7 Seal Kit covers the full working attachment seal kit for PC300-7 applications and is available from our Mumbai stock.

Engine — SAA6D114E-3 — Common Issues and Key Parts

The SAA6D114E-3 is a proven, conservative engine design that has accumulated tens of millions of operating hours across the Komatsu product range. It is not troublesome, but the conditions under which Indian PC300s work — high ambient temperatures, variable fuel quality, and extended hours without dealer-level service — create predictable failure patterns that experienced operators learn to anticipate.

Common Issues in Indian Operating Conditions

• Cooling system neglect — the primary killer. The 8.3-litre engine's coolant system requires a proper antifreeze/coolant mix even in India's tropical climate — plain water corrodes the aluminium components of the cooling circuit and allows scale build-up that reduces flow. Head gasket failures from overheating are preventable; replace coolant at 4,000-hour intervals and never allow the system to run below minimum level.
• Turbocharger oil seal wear. Blue smoke at cold startup (clearing after warm-up) indicates early turbocharger shaft seal wear. Catching this at the seal stage — a rebuild or exchange turbocharger — prevents oil ingestion into the intercooler and intake manifold, which causes oil contamination of the air charge and accelerates wear on the liner-piston ring interface.
• Injection pump wear on high-hour machines. The SAA6D114E-3 uses an in-line mechanical fuel injection pump (Bosch P-series equivalent). On machines above 15,000 hours, the pump's calibration drifts — presenting as hard starting, increased fuel consumption, and black smoke under load. A recalibrated or rebuilt pump (not a new OEM unit, which is rarely justified economically) restores performance at a fraction of the cost of an engine overhaul.
• EGR cooler fouling (PC300-8). The Tier 3 PC300-8 uses an EGR (exhaust gas recirculation) system. Indian diesel fuel, with higher sulphur content than European specification, accelerates EGR cooler deposit build-up. Clean at 3,000-hour intervals or when the machine shows progressive power derate without other fault causes.
• Pre-cleaner seal degradation. The pre-cleaner and air filter housing seals harden and crack in sustained high-temperature environments. A cracked pre-cleaner seal allows fine dust to bypass the primary filter — leading to accelerated liner and piston ring wear that manifests as high oil consumption before any other symptom appears. Check these seals at every filter change.

Key Engine Parts — PC300-7 / PC300-8 (SAA6D114E-3)

Part	Komatsu Part Number	OEM vs Aftermarket	Notes
Cylinder head assembly	6137121200	OEM or CTP aftermarket	Fits PC300-7 and PC350-7; confirm serial range
Head gasket / full gasket set	6136-K2-9901	Quality aftermarket acceptable	Low-structure gasket set for PC300-7
Head gasket kit (PC300-8)	6138K15200	Quality aftermarket acceptable	PC300-8 head gasket kit; confirm -8 serial
Valve guide	6130111310	OEM or quality aftermarket	Replace all guides at cylinder head rebuild
Water pump	6731-61-1400 (approx.)	Quality aftermarket acceptable	Replace at engine overhaul or on leak/bearing failure
Thermostat	6732-61-2100 (approx.)	Quality aftermarket acceptable	Critical — failure in closed position causes severe overheating
Turbocharger	6731-81-8100 (approx.)	OEM or specialist reman	Confirm specific variant; PC300-8 Tier 3 turbo differs from -7
Crankshaft rear seal	6130224230	OEM recommended	Rear main seal; replace at flywheel removal
Engine oil filter	600-211-1231	Quality aftermarket acceptable	Change every 500 hours; do not extend interval

Undercarriage — Track Chain, Rollers, Idler, Sprocket

Undercarriage cost on the PC300 is substantial — a full undercarriage replacement (both track chains, all rollers, idlers, and sprockets) runs ₹5,00,000–9,00,000 depending on whether OEM or quality aftermarket components are used. Operators who track wear correctly and replace components at the right time — not too early, but never so late that worn components accelerate damage to adjacent parts — achieve 20–30% better undercarriage cost-per-hour than operators who run to failure.

PC300 Undercarriage Configuration

• 2 track chains — left and right, each with 51 links (PC300-8 standard configuration; PC300LC-8 uses 53 links)
• 14 bottom rollers (track rollers) — 7 per side on standard; PC300LC-8 uses 8 per side
• 4 top rollers (carrier rollers) — 2 per side standard configuration
• 2 front idlers — 1 per side
• 2 rear sprockets — 1 per side, driven by final drive

PC300 Undercarriage Inspection — Wear Limits

Component	New Dimension	Replace at	How to Measure
Track chain pitch (10-link)	1,960 mm (196 mm per link)	When 10-link length exceeds 2,000 mm (2% elongation)	Measure pin centres across 10 links under light tension
Link height (shoe side)	93 mm (approx.)	Below 83 mm (10 mm wear)	Shoe contact face to link rail top surface
Bushing outer diameter	67 mm (approx.)	Below 61 mm	Caliper at bushing mid-point
Bottom roller flange width	120 mm (approx.)	Below 108 mm	Caliper across both flanges at widest point
Idler tread width	155 mm (approx.)	Below 135 mm	Measure across contact face with chain
Sprocket tooth thickness	28 mm (approx.)	Below 18 mm or hook-shaped profile	Mid-tooth thickness measurement
Track shoe grouser height	32 mm (triple grouser)	Below 16 mm (50% wear)	Shoe base to grouser tip

OEM vs Aftermarket — PC300-Specific Comparison

For the full framework on OEM versus aftermarket decisions in the Indian market, see our OEM vs Aftermarket Heavy Equipment Parts guide. For the PC300 specifically, the economics strongly favour quality aftermarket on wear items and most service parts. OEM is justified only on precision fuel system components and, where available, on genuine Komatsu exchange units for major assemblies.

Part	Recommendation	Typical OEM Cost	Typical Aftermarket Cost	Saving
Filter kit (oil + fuel + air)	Quality aftermarket	₹8,000–12,000	₹3,000–5,000	55–60%
Hydraulic return filter	Quality aftermarket	₹4,500–7,000	₹1,500–2,800	55–60%
Cylinder seal kits (full set)	Quality aftermarket	₹45,000–70,000	₹15,000–25,000	60–65%
Main hydraulic pump	OEM reman or specialist reman	₹5,50,000–9,00,000	₹1,80,000–3,50,000 (reman)	50–60%
Oil cooler	Quality aftermarket	₹65,000–1,10,000	₹22,000–40,000	60–65%
Full undercarriage set	Quality aftermarket	₹5,00,000–9,00,000	₹1,80,000–3,20,000	60–65%
Cylinder head assembly	OEM or CTP aftermarket	₹1,50,000–2,50,000	₹55,000–90,000	60–65%
Full gasket set	Quality aftermarket	₹25,000–40,000	₹8,000–15,000	60–65%
Turbocharger	OEM or reputable reman	₹1,10,000–1,80,000	₹40,000–80,000 (reman)	50–55%

How to Identify Your PC300 Generation

The Komatsu serial number plate is located on the right side of the upper frame, near the engine compartment on the counterweight side. A second plate appears on the right cab door frame. The format is always: model code + hyphen + serial number. For the PC300LC, the plate reads "PC300LC-7" or "PC300LC-8" with a separate serial sequence from the standard PC300.

Serial Prefix	Generation	Production Period (approx.)	Engine
A11001~	PC300-6	1993–2000	SAA6D108E-2 (6.5L, ~160 kW)
B30001~	PC300-7	2000–2007	SAA6D114E-3 (8.3L, 170 kW)
C20001~	PC300-8	2007–2018	SAA6D114E-3 Tier 3 (8.3L, 177 kW)
L10001~	PC300LC-7	2000–2007	SAA6D114E-3 (8.3L, 170 kW)
C20001~	PC300LC-8	2007–2018	SAA6D114E-3 Tier 3 (8.3L, 177 kW)

If you have a partial or damaged serial plate, the engine serial number (stamped on the engine block itself, on the rear right side of the block near the flywheel housing) provides an independent identification path. Photograph both the machine serial and engine serial and send to us — we cross-reference to the correct parts specification, usually within 30 minutes during business hours.

For our full Komatsu PC300 inventory:

• All Komatsu Parts — Mumbai Stock
• Komatsu PC200 Parts Guide
• Komatsu Excavator Maintenance Guide — All Models