Overhaul & Service Kit – Models UP5-18-8 & ML75

Two maintenance kits covering different power tiers of fixed-speed rotary screw compressors. UP5-18-8 serves the 18.5 kW frame (nominal 8 bar, ~2.1 m³/min output) — a compact unit common in workshops, auto repair bays, and light manufacturing. ML75 is the 75 kW frame (~10–11 m³/min @ 7–8 bar) used in larger plants, pneumatic conveying, and multi-line production. Both kits consolidate wear-items from routine 2000-hour service through full airend overhaul.

Kit Tiers

• Tier A – Routine (2000 h / 6 months): Air filter cartridge, oil filter spin-on, oil separator cartridge, shaft seal minor kit, drain valve O-ring set

  
  

• Tier B – Intermediate (4000–6000 h): Tier A + inlet valve rebuild kit (spring, poppet, seat), thermostat valve cartridge, check valve O-ring set, V-belt matched set (if belt-drive)

  
  

• Tier C – Major Overhaul (12000–16000 h): Tier B + airend bearing set (DE/NDE), rotor labyrinth seals, full gasket kit, coupling elastomer (direct-drive)

  
  

Technical Specifications

Application Guidance

UP5-18-8 kit – Service on 18.5 kW compact frames in small workshops, tire shops, paint booths, and light pneumatic tool supply. The small-canopy design means separator and air filter dimensions are trimmed — confirm kit tier before ordering as UP-series sub-revisions exist (UP5-18-8 vs. UP5-22-8 share some parts but separator OD differs).

ML75 kit – Service on 75 kW frames in medium plants, food processing, textile, and centralized plant-air networks. The ML frame typically runs direct-drive with a flexible coupling — Tier C kits include the coupling elastomer which the UP5 (belt-drive) does not.

📎 Tier selection: Tier A every 2000 h; Tier B every 4000–6000 h or when separator ΔP > 0.8 bar; Tier C at 12000–16000 h, or when airend discharge temp rises >10 °C above baseline, vibration increases, or oil carryover >5 ppm. UP5-18-8 and ML75 share no interchangeable dimensions — air filter, separator, and oil filter are all frame-specific.

Installation Notes (Tier C / Airend)

1. Lock out electrics, depressurize receiver and oil circuit to 0 bar.

   
   

2. Drain warm oil; remove separator housing lid, lift old cartridge via center bolt, replace lid O-ring.

   
   

3. Swap air filter cartridge and spin-on oil filter (¾ turn hand-tight, no strap wrench).

   
   

4. Airend work: strip inlet bell, extract rotor, press out old bearings, fit new labyrinths (clearance 0.10–0.15 mm for UP5-class small airend; 0.12–0.18 mm for ML75), torque bell bolts cross-pattern (UP5: 35–45 N·m; ML75: 55–70 N·m).

   
   

5. Refill to sight-glass midpoint with ISO VG 46 synthetic; run 5 min, top up, recheck.

   
   

6. Log service tier, hours, oil batch, airend measurements.

   
   

Quality

• Separator media ≤3 ppm residual oil (ISO 8573-2 ref.)

  
  

• Air filter 99.9 % @ 5 µm (ISO 5011)

  
  

• Viton/NBR seals rated 80–100 °C continuous oil-mist

  
  

• Bearings matched pairs, C3 clearance

  
  

Ordering

Specify UP5-18-8 or ML75 followed by Tier A / B / C. Each kit ships with component checklist and torque sheet. Provide compressor serial number to confirm revision — UP5-18-8 has multiple sub-builds (belt-drive vs. direct-drive late units) affecting V-belt vs. coupling elastomer inclusion.

All dimensions nominal; confirm separator OD/length, air-filter dimensions, and drive type (belt vs. direct) against your machine tag before ordering Tier C airend parts.