35-tonne crawler excavator maintenance and fitment
Komatsu PC360LC-11 Undercarriage Inspection and Parts Guide
The PC360LC-11 is a large crawler excavator, and its undercarriage carries substantial working and travel loads. Current Komatsu specifications identify a sealed track, hydraulic adjusters, eight track rollers and two carrier rollers per side on the listed configuration. Those figures help an inspection, but they do not replace the serial number, installed-part evidence, or market-specific parts information.
1. Confirm the exact PC360LC-11 before selecting parts
Photograph the machine identification plate and record the complete model designation, serial number or PIN, destination market, application package, and any suffix. Do not shorten the identity to "PC360". Komatsu currently lists the standard PC360LC-11 alongside PC360LCi-11, super-long-front, waste-handler, and other related arrangements. Similar names do not prove that all crawler components are interchangeable.
Photograph the complete left and right undercarriages from the side, front, and rear. Include the track shoes, chain, lower rollers, carrier rollers, front idler, sprocket, track guides, guards, adjuster area, and visible cast or stamped numbers. Previous repair work may have changed the installed group, so the machine record and physical evidence should agree.
This independent educational guide is not affiliated with or endorsed by Komatsu. The brand and model are used only for equipment identification and maintenance discussion.
2. PC360LC-11 undercarriage configuration: useful facts and limits
The current US Komatsu product page lists an X-frame center frame, box-section track frames, hydraulic track adjusters, 48 shoes per side, eight track rollers per side, two carrier rollers per side, and a sealed track. It also lists 700 mm, 800 mm, and 850 mm shoe choices in different equipment sections. The published operating-weight range is approximately 35,627 to 36,535 kg.
| Published detail | Inspection use | Fitment warning |
|---|---|---|
| 8 lower rollers and 2 carrier rollers per side | Provides a reference for the listed configuration | Count the installed machine and confirm serial data |
| 48 shoes per side | Supports chain and shoe inventory checks | Do not infer pitch or chain part number from count alone |
| Sealed track | Directs attention to joints, seals, dryness, and pitch wear | Confirm the actual replacement-chain construction |
| Hydraulic track adjuster | Requires inspection of tension stability and grease leakage | Service stored pressure only by the correct manual |
| Multiple shoe widths listed | Connects shoe choice with ground conditions and loading | Measure installed width, profile, holes, and bolt pattern |
Regional specifications and optional equipment can differ. A brochure dimension or count is a research reference, not a purchase order. Use the machine's applicable parts book and operation and maintenance manual.
3. Complete PC360LC-11 undercarriage inspection
Park on a firm, level surface, lower the attachment, apply the required controls, stop the engine, and isolate stored energy. Clean the undercarriage enough to expose wear surfaces and leakage. Perform left and right inspections in the same sequence so the results can be compared.
Track chain, links, pins, bushings, and shoes
Look for dry or stiff joints, oil loss, shifted pins, cracked links, abnormal side wear, rail-height differences, damaged master connections, bent shoes, worn grousers, loose hardware, elongated holes, and polished contact marks. Measure chain pitch over the span and by the procedure specified for the installed chain. Record shoe width and working conditions; wider shoes can improve flotation but may increase leverage in hard or rocky ground.
Track rollers and carrier rollers
Check each of the eight lower-roller positions and both upper-roller positions on each side. Record flange arrangement, shell wear, active leakage, fresh oil tracks, cracks, flat spots, abnormal heat, restricted rotation, mounting movement, and chain contact. A single leaking roller is not automatically the only cause of uneven wear; compare the full roller sequence and rail path.
Front idler, guides, and track adjuster
Inspect idler tread and flanges, side clearance, guide-plate contact, frame position, bearing or seal leakage, and damage from packed material. Check the adjuster area for grease, contamination, damaged fittings, and tension that changes after the correct adjustment. Never disassemble the recoil or adjuster assembly without the approved procedure and tooling.
Sprocket and final-drive area
Inspect tooth profile, cracks, fasteners, chain engagement, mud packing, and contact patterns. Listen for rough engagement and compare the left and right sides. Chain pitch and sprocket wear develop together, so a new chain should not be paired with an unmeasured worn sprocket merely because the tooth tips look acceptable.
Track frame, guards, and mounting areas
Look for cracks, damaged welds, bent guards, loose mounting hardware, distorted brackets, debris traps, and bright rub marks. Confirm that guides and guards are not forcing the chain sideways. A roller or idler replacement cannot correct a damaged mounting surface or frame-alignment problem.
4. What PC360LC-11 wear patterns can tell you
| Pattern | Possible contributors | Next checks |
|---|---|---|
| One side wears faster | Turning direction, slope work, unequal packing, tension difference, alignment, or local component condition | Compare both sides, work history, frame contact, and measurements |
| Heavy roller-flange contact | Side loading, chain guidance, worn idler guides, bent guards, or tight turning | Rails, rollers, idler position, guides, and frame geometry |
| Upper chain rub or vibration | Carrier-roller wear, seizure, chain wear, tension, packing, or damaged mount | Both carrier rollers, pitch, sag method, and contact marks |
| Rough sprocket engagement | Pitch wear, tooth wear, stiff joints, debris, or mismatched components | Measure chain and sprocket together |
| Idler near the forward end of travel | Chain wear, adjustment history, packing, or component variation | Pitch measurement, correct sag, and adjuster condition |
| Track will not hold adjustment | Grease leak, valve or seal issue, internal adjuster damage, packing, or worn chain | Repeat the manual method and obtain qualified service inspection |
These are diagnostic directions, not final diagnoses. Load, material, moisture, travel direction, attachments, grade, operator technique, and maintenance history all affect the pattern.
5. Maintenance priorities for a PC360LC-11 undercarriage
Komatsu's current undercarriage guidance emphasizes correct track adjustment, cleaning, reduced reversing, awareness of working conditions, and periodic measurement. Apply those principles through the exact PC360LC-11 manual. Track sag is not a universal number: machine position, cleaning condition, measurement points, installed chain, and ground material matter.
- Clean before measuring. Packed mud can change tension and hide leakage or contact.
- Use repeatable records. Keep dated left-right measurements for chain pitch, rail height, roller and idler wear, sprocket condition, shoe wear, and adjuster position.
- Correct operating contributors. Reduce unnecessary counter-rotation and reversing, avoid constant travel on one slope direction where practical, and match shoe width to underfoot needs.
- Plan mating parts together. Assess chain, sprocket, idler, rollers, guides, shoes, and hardware as a system.
- Investigate sudden change. New noise, heat, leakage, tension loss, vibration, or tracking change deserves inspection before it becomes a larger repair.
Use calibrated measurements and the correct wear limits to decide when to monitor, repair, or replace. A generic percentage or internet chart cannot substitute for serial-specific service data.
6. Information needed for PC360LC-11 undercarriage parts
- complete model designation, serial number or PIN, market, and application package;
- part name, installed side and position, required quantity, and readable part number;
- track-link, shoe, lower-roller, and carrier-roller counts from the actual machine;
- shoe width, grouser type, bolt pattern, hole count, bolt size, and travel direction;
- roller flange type, mounting holes, bolt-center dimensions, shaft or bracket details, and offsets;
- track pitch, link profile, master connection, pin and bushing details, and measured wear span;
- clear overall, end, mounting-face, wear-surface, and installed-position photos;
- failure symptom, previous repairs, ground conditions, quantity, and destination country.
For paired replacements, label every photo and measurement by side and position. Confirm whether hardware, seals, brackets, or fasteners are included or required separately. Similar appearance is not sufficient evidence of fit.
Frequently Asked Questions
How many track rollers does a PC360LC-11 have?
The current Komatsu US specification lists eight lower rollers and two carrier rollers per side for the described configuration. Verify the installed machine and serial-specific parts information before ordering.
Do all PC360LC-11 excavators use the same track shoes?
No assumption should be made. Komatsu lists multiple shoe-width options, and market or application configurations can differ. Record the actual width, profile, mounting pattern, part number, and serial identity.
Can PC360LCi-11 undercarriage parts be ordered as PC360LC-11 parts?
Do not rely on the family name. Use the complete designation, serial range, installed counts, catalog information, and physical dimensions to confirm any shared component.
Should chains and sprockets be replaced together?
Measure both as a mating system. Replacement scope depends on their wear stage, engagement, remaining limits, application, and service guidance rather than a universal rule.
Technical references
Check PC360LC-11 Undercarriage Replacement Options
Send the complete machine identity, serial plate, installed-part photos, markings, counts, and agreed measurements for a model-specific review. We can check suitable supply options for requested items such as:
- track rollers and carrier rollers;
- front idlers and sprockets;
- track chains, track shoes, adjuster-related items, and fasteners.
Corporate Email: sales@china-ysm.com
WhatsApp: +86-18606961587
Compatibility and availability must be confirmed from the complete model, serial number, part number, photos, dimensions, quantity, destination country, and working conditions before ordering.
