Heavy-Duty Spin-On Lube Filter & Return-Line Cartridge – Models 35A40-01800 & 35C40-11100

Two complementary filtration elements for heavy-duty diesel power packs and their attached hydraulic circuits. 35A40-01800 is a full-flow spin-on lube-oil filter with a 128 mm OD × 170 mm canister, while 35C40-11100 is a star-pleat return-line / lube-loop cartridge (outside-in flow) for the same equipment family's hydraulic or auxiliary lubrication system. Both use glass-fiber media and are built for continuous-duty offshore, marine-generator, and construction-machinery environments.

Key Features

• 35A40-01800: Spin-on lube, 1-3/8"-16 UN thread, rolled steel shell, anti-drain-back valve, bypass integrated

  
  

• 35C40-11100: Star-fold cartridge, outside→inside flow, epoxy-bonded end caps, high-collapse center tube

  
  

• Glass-fiber media, 10–15 µm (A) / 3–20 µm optional (C), β₁₀ ≥ 200 class

  
  

• NBR seals standard; FKM available for high-temperature or ester duty

  
  

• Corrosion-resistant shell finish (A) / stainless or tin-plated cage (C)

  
  

Technical Specifications

Application Guidance

35A40-01800 – Full-flow lube filtration on S-series 6-cylinder diesel engines used in marine gensets, offshore power units, and heavy construction equipment. The 128 mm OD canister provides generous media area for high-soot, long-drain operation (2000 h typical service interval). Direct thread-mount to the engine's lube-head — no loose parts on service.

35C40-11100 – Return-line or auxiliary lube-loop cartridge on the same platform's hydraulic/compressor package. Star-fold geometry maximizes media area in a compact OD, handling high dirt loads from compressor-lube or tank-return flows. Outside-in flow with epoxy-sealed end caps resists unraveling under pulsed flow.

Fluid Compatibility

• Mineral engine oil (API CK-4, CJ-4)

  
  

• Mineral hydraulic oil (ISO HM, HV)

  
  

• Diesel fuel (35A40-01800 head-dependent)

  
  

• HFC water-glycol – NBR acceptable; FKM recommended for sustained duty

  
  

• Not for phosphate ester (HFDR) without seal/media upgrade

  
  

Installation & Service

1. 35A40-01800: Clean head face, lubricate gasket with clean oil, spin on by hand until seated + ¾ turn. Do not over-torque. Pre-fill if head design allows.

   
   

2. 35C40-11100: Open housing, lift old cartridge by the center tube, inspect cage & O-ring groove. Seat new element with flow arrow (outside→inside). Torque housing bolts evenly.

   
   

3. Replace per OEM hour interval or when ΔP reaches bypass threshold (typically 2.5–3.0 bar for lube, 1.5–2.0 bar for return).

   
   

Quality Assurance

• SAE J1858 / ISO 4548 (lube elements) – efficiency & capacity

  
  

• ISO 16889 (cartridge) – multi-pass β-ratio

  
  

• ISO 2941 – collapse resistance (C)

  
  

• ISO 2943 – media/fluid compatibility

  
  

• Shell burst / pressure-check before packing

  
  

Ordering

Quote 35A40-01800 (128×170 mm spin-on, lube) or 35C40-11100 (star-pleat cartridge, return/lube-loop) with micron rating, seal material, and quantity. Cross-reference to common OEM engine/compressor numbers available on request — provide your engine model or machine OEM number for confirmation.

All values nominal; confirm thread, gasket, head type, and pressure class against your actual assembly before installation.