LB75
The LB75 (LB75) piston block is a three-cylinder, single-stage pump unit used in compressor units of the Remeza (Aircast) brands.
LB75 piston block – buy in Moldova
The LB75 (LB75) block is a three-cylinder, single-stage pump unit manufactured by Remeza (Belarus), widely used in compressor units of the series Aircast SB4. High flow rate (880 l/min), robust design, and wide availability of spare parts make it the optimal choice for industrial applications.
Original Parts and Service
Acvatron supplies genuine spare parts for the LB75 block: pistons, rings, valve plates, air filters, and bearings. All components are certified for the Moldovan market and are available from our warehouse in Chisinau.
Selection Consultation
For accurate selection of the crankshaft, gaskets, and fasteners, we recommend providing a photo of your unit’s nameplate. Our specialists will promptly select the correct parts.
Technical characteristics
| Количество цилиндров | 3 |
| Ступени сжатия | 1 (одноступенчатый) |
| Piston diameter | 80 mm |
| Productivity (1 block) | 880 l/min |
| Productivity (tandem) | 1760 l/min |
| Maximum pressure | 10 bar (1.0 МПа) |
| Nominal frequency of rotation | 1040 min⁻¹ |
| Nominalnaya power of the engine | 5.5 kW |
| Drive belts | 2 × А1600 |
| Diameter of flywheel (шкива) | 368 mm (cast iron) |
| Объем масла | 1.8–1.9 l |
| Момент затяжки головок (М8) | 22–27 Н·м (рек. 25 Н·м) |
| Подшипник передний | 6307 Z |
| Подшипник задний | 6304 |
Main Spare Parts
| Part | Description | Article |
|---|---|---|
| Piston 80 mm | 3 pcs. per block | 21141004 |
| Piston Rings | Set for 1 piston: 2 compressors (h=2.5 mm) + 1 oil scraper. (h=4 mm) | 21145004 / PRZ011914 |
| Valve plate assembly | Valve unit | 21124019 |
| Air filter assembly | 3 pcs. | 21175003 |
| Replacement filter cartridge | Replace every 600 hours | 21175007 |
| Flywheel (pulley) | Ø 368 mm, cast iron | 21212004 |
| Front Bearing | — | 6307 Z |
| Rear Bearing | — | 6304 |
* For precise selection of crankshaft, gaskets, and fasteners, refer to the unit’s nameplate photo.
Maintenance Schedule
Checking the Oil Level
Daily before starting. Check the level at the red mark on the sight glass.
Recommended grades: viscosity 100 mm²/s at 40°C.
First Oil Change
Drain the oil, flush the crankcase, and add 1.8 liters of fresh oil.
Scheduled Oil Change
Regular oil changes according to the maintenance chart.
Tightening the cylinder head bolts
Tighten the M8 bolts to 25 Nm (tolerance 22–27 Nm).
Only on a completely cool engine. Before working, disconnect the power supply and relieve the pressure.
Air Filter Maintenance
Checking and cleaning 3 air filters (part number 21175003).
Complete replacement of cartridges (part number 21175007).
Checking Belt Tension
The deflection of the A1600 belts is 5–6 mm at a force of 30–40 N.
If there is any deviation, adjust the engine position.
- SB4/S-100.LB75
- SB4/F-270.LB75 (including the LB75B modification)
- SB4/F-500.LB75
- SB4/F-500.LB75T (and TB modifications) – installations with two units on one receiver.
- 1.8 liters — according to the main technical specifications table for the SB4/S-100.LB75, SB4/F-270.LB75 and SB4/F-500.LB75.
- 1.8 + 1.8 liters — for tandem models (with two blocks), such as SB4/F-500.LB75T and SB4/F-500.LB75TB.
- 1.9 liters — indicated in the parts summary table for the LB 75 block.
- For specific modifications of Aircast installations volume may be less:
- 1.52 liters – for model SB4/S-LV75.P.
- 1.45 liters — for the SB4/S-LV75.L model.
- Tightening torque for threads M8:is from 22 to 27 N m.
- Recommended value: The Aircast installation manual for piston blocks of this series also specifies a specific value –25 Nm.
- Frequency: Checking and tightening the bolts must be carried out after the first 8 and 50 hours of compressor operation. This is required to compensate for thermal shrinkage of the gaskets.
- Tightening condition: Tighten the bolts only after the piston block has completely cooled to ambient temperature..
- Safety:Before starting work, be sure to disconnect the compressor from the power supply and completely relieve the pressure from the receiver..
