Crankshaft Remeza LT100 — Part No. R 21131009

Remeza LT100 Compressor: Technical Profile

The LT100 is a three-cylinder industrial Remeza compressor with belt drive, designed for continuous operation in production environments. Crankshaft R 21131009 is engineered for the loads of this configuration — three crankpins for three in-line cylinders.

The Role of the Crankshaft in LT100 Operation

The crankshaft is the foundation of the crank mechanism. Its functions:

1. Receives torque from the V-belt drive pulley
2. Converts rotation into reciprocating motion via the connecting rods
3. Synchronises the strokes of all three cylinders — intake, compression, discharge
4. Runs on main bearings in the crankcase — which carry the radial loads

The crankshaft operates under cyclic impact loads and heat. With correct lubrication and no oil starvation, its service life is comparable to that of the whole compressor. Premature failure is always the result of operating violations.

Technical Specifications of Crankshaft R 21131009

💡 Important: before ordering, cross-reference part R 21131009 against your LT100 compressor serial number. Different production series may have different crankshaft configurations. Confirm with an Acvatron SRL engineer using your unit number: +373 22 503-580.

Causes of LT100 Crankshaft Wear and Damage

The crankshaft is a long-life component. Premature failure always has a specific cause:

Oil starvation Insufficient oil level or overdue oil changes lead to dry friction between the crank/main journal surfaces and bearings. Journal surface seizure is irreversible damage requiring crankshaft replacement.

Hydraulic shock Liquid entering a cylinder (condensate, oil) during operation causes a sudden impact load on the connecting rod and journal. Journal cracking or fracture is possible.

Fatigue wear under overload Operating the compressor beyond rated parameters (continuous duty without pauses, pressure above rated) accumulates fatigue cracks in the shaft body.

Abrasive wear Oil contamination with abrasive particles (failed filtration, dust ingress into the crankcase) wears journal and bearing surfaces.

Pulley imbalance Drive pulley imbalance creates alternating loads on the main journals, accelerating their wear.

Signs of Crankshaft Failure: When to Inspect

• Knocking in the crankcase — characteristic metallic knock during operation that varies with speed; sign of bearing wear or bearing spin
• Excessive vibration not related to loose fasteners
• Critical oil pressure drop at normal oil level — journal clearances have exceeded tolerance
• Metal swarf in the oil at drain — result of journal surface seizure
• Cracks in the shaft body — found during visual inspection after crankcase disassembly

⚠️ Critical: continuing to run the compressor with crankcase knock inevitably leads to connecting rod failure, crankcase fracture, and irreparable unit damage. If a characteristic knock is heard — stop the compressor immediately and disassemble.

Crankshaft Replacement Procedure for Remeza LT100: Key Steps

Crankshaft replacement is a major overhaul requiring complete disassembly of the cylinder head and crankcase.

1. Preparation

Isolate the compressor from power, bleed pressure to zero, and drain all oil from the crankcase.

2. Remove the drive pulley and belts

Remove the V-belts, undo the pulley retaining nut, and remove the pulley using a puller — not by hammering.

3. Disassemble the cylinder head

Remove the cylinder heads, valve blocks, and cylinders. Extract the pistons with connecting rods.

4. Remove the crankcase cover and crankshaft

Undo the crankcase cover, extract the crankshaft. Check the condition of the main bearings and housings.

5. Inspection

Measure the crankpin and main journal diameters with a micrometer. Compare against tolerances in Remeza documentation. If seizure or out-of-round exceeds tolerance — crankshaft replacement is mandatory.

6. Install new crankshaft R 21131009

Fit new main bearing shells, lubricate the journals with engine oil, install the crankshaft. Bearing cap torque — strictly to specification.

7. Reassembly and run-in

Reassemble in reverse order with new gaskets. Fill with fresh compressor oil. Run-in: first 30 minutes unloaded, monitor oil pressure and head temperature.

Associated Parts for LT100 Major Overhaul

When replacing the crankshaft, we recommend renewing the complete repair kit at the same time:

• Crankshaft R 21131009 — this item
• Main bearing shells — mandatory replacement with a new crankshaft
• Connecting rod bearing shells — replace together with main bearings
• Piston rings — if cylinder wear is also present
• Head and crankcase gaskets — always replace during disassembly
• Compressor oil — first change after 50 operating hours post-overhaul
• V-belts — if not replaced in the last 1,500–2,000 operating hours

Check parts availability with Acvatron SRL engineers: +373 22 503-580.

Why Genuine Remeza Crankshaft R 21131009 Matters vs. Alternatives

The crankshaft is not a part to cut costs on. A mismatch in pulley keyway dimensions or journal diameter against main bearing tolerance when fitting an alternative leads to accelerated wear and repeat disassembly.

Expert Opinion

“The LT100 crankshaft is one of those rare parts where the order means the compressor is already down. So delivery speed is critical here. The second key point: replacing the crankshaft without simultaneously replacing the bearing shells is a waste of money. A new shaft with worn shells will produce the same knock after 200–300 hours. I always recommend replacing the crankshaft, all bearing shells, and piston rings as a set during an LT100 overhaul — it’s the only way to achieve a service life comparable to a new unit. And you must identify the cause of the shaft failure: if it’s oil starvation — fix it, otherwise the new shaft won’t last any longer than the previous one.”

Vitaly Boluchevsky, Chief Engineer at Acvatron SRL, 15 years in the industry

FAQ

❓ Is crankshaft R 21131009 compatible with other Remeza models besides the LT100? No. Part R 21131009 is listed in the parts catalogue for the Remeza LT100 compressor only. Other models (LB30, LB40, LH20, etc.) use crankshafts with different geometry and different part numbers. Fitting an incorrect crankshaft is either impossible or will cause rapid bearing failure.

❓ Can the worn crankshaft be reground rather than replaced? In theory — yes, if journal wear is minor (up to 0.05–0.1 mm), there are no cracks or seizure, and undersize bearing shells are available. In practice, for the LT100 in Moldovan conditions, fitting a new genuine crankshaft R 21131009 is simpler and more reliable — the cost of regrinding plus shipping the shaft for reconditioning is comparable to the price of a new part.

❓ How long does delivery of crankshaft R 21131009 take? Delivery times for genuine Remeza parts should be confirmed with Acvatron SRL managers at the time of enquiry — +373 22 503-580. If in stock — same-day collection after payment. For urgent supply, an engineer will identify the nearest available option.

❓ What should be checked before fitting the new crankshaft? Before installing R 21131009: measure the main bearing housings in the crankcase (housing wear prevents correct seating of a new shaft); inspect the crankcase for cracks; clear oil passages of metal swarf; fit new main bearing shells.

Why Acvatron SRL

Genuine Remeza spare parts with documentation Acvatron SRL supplies Remeza parts strictly from the factory catalogue. Full accompanying documentation, VAT invoice, and contract for legal entities.

Engineering selection of the complete repair kit Provide the LT100 model and serial number — an Acvatron SRL engineer will select the crankshaft, bearing shells, rings, and gaskets as a single kit for the major overhaul.

In stock in Chișinău Remeza compressor spare parts stocked at acvatron.md. Same-day collection after payment when available.

Service and repairs Acvatron SRL performs major overhauls of Remeza piston compressors in Chișinău — from diagnosis through run-in after crankshaft replacement.

Documents for legal entities VAT invoice, contract, full accompanying documentation.