High-Performance Hydraulic Oil Filters – Models FC-2703 & FC-7903

Two spin-on hydraulic filter cartridges from the same FC-series family, covering mid-size return/steering circuits and large-flow main return or low-pressure pump-guard duties. FC-2703 sits on 1-14 UNS or 1-1/4-12 UNF heads (93–108 mm OD × 175–200 mm length) for mid-size excavators, forklifts (TCM-class), and wheel loaders. FC-7903 is the larger sibling (118+ mm OD × 260–300 mm, 1-1/2-16 UNF or M95 class) for 30–50 t excavators, large wheel loaders, and stationary hydraulic power units where flow peaks exceed 200 L/min.

📎 Note: The FC- prefix in this catalog family is used across both fuel and hydraulic spin-ons. FC-2703 cross-references to HC-2703 in the hydraulic sub-line (TCM 26267-67002 pattern) — the specs below follow the hydraulic trim (glass-fiber media, β₁₀ ≥ 200). Confirm your head accepts a hydraulic spin-on before fitting; fuel-head threads sometimes differ.

Key Features

• FC-2703: Glass-fiber composite, 10 µm (β₁₀ ≥ 200), square gasket 105/94 mm (hydraulic HC-2703 trim) or 69/59 mm (fuel trim — confirm), bypass ~2.5 bar

  
  

• FC-7903: Glass-fiber composite, 10–15 µm (β₁₀ ≥ 200), larger canister for 200+ L/min flow, bypass ~2.5 bar, nitrile gasket standard

  
  

• Rolled carbon-steel shell, zinc-plated end caps, corrosion-resistant finish

  
  

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

  
  

• Anti-drain-back membrane (both) for pressure-line or pump-guard placement

  
  

• Laser-etched part number and flow arrow on shoulder

  
  

Technical Specifications

Application Guidance

FC-2703 – Return-line, steering-return, or fork-lift hydraulic guard (TCM 26267-67002 cross pattern). The 1-14 UNS or 1-1/4-12 UNF head fits mid-size excavators, warehouse forklifts, and small wheel loaders. Also deployable as compressor-lube or PTO-loop guard on compact power packs. If your head currently carries an FC-2703 fuel spin-on, the hydraulic glass-fiber variant swaps in the same thread — just confirm gasket (69/59 fuel vs. 105/94 hyd square) before ordering.

FC-7903 – Main return or pump-discharge guard on 30–50 t excavators, large wheel loaders, and stationary power units (injection molding, press brakes, hydraulic gen-sets). The tall canister and large-bore head handle 200+ L/min flow with extended dirt-holding. Can also serve as cooler-loop filter on large compressor skids.

⚠️ Thread & gasket mismatch risk: FC-2703 exists in fuel (1-14 UNS, 69/59 sq gasket) and hydraulic (1-1/4-12 UNF, 105/94 sq gasket) trims — same FC number, different head. Verify which head you have before ordering. FC-7903 = larger head (1-1/2-16 or M95), not interchangeable with 2703.

Fluid Compatibility

• Mineral hydraulic oil (ISO HM, HV)

  
  

• Biodegradable esters (HEES, HETG) – use FKM seals

  
  

• HFC water-glycol – NBR acceptable; FKM recommended

  
  

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

  
  

Installation & Service

1. Clean filter head face; inspect threads, center tube (if present), and gasket groove.

   
   

2. Lubricate gasket with clean hydraulic oil, spin on by hand until seated + ¾ turn. No strap wrench on the canister — over-torque deforms the rolled shell.

   
   

3. For pressure-line / pump-guard: pre-fill if head design allows.

   
   

4. For return: confirm flow arrow (canister → head) and bypass direction.

   
   

5. Replace per OEM interval (FC-2703 ~1500–2000 h; FC-7903 ~2000–3000 h) or when ΔP reaches bypass.

   
   

6. In dusty/demo sites, shorten 30 % — indicator climbs faster than hour-meter.

   
   

Quality Assurance

• ISO 16889 – multi-pass β-ratio & dirt capacity

  
  

• ISO 2941 – collapse/burst resistance

  
  

• ISO 3968 – pressure drop vs. flow

  
  

• ISO 2943 – media/fluid compatibility

  
  

• Shell burst test per batch (≥ 4× working pressure)

  
  

Ordering

Quote FC-2703 (93–108×175–200 mm, 1-14 UNS or 1-1/4-12 UNF, mid return/steering — confirm fuel vs. hyd trim) or FC-7903 (~118–130×260–300 mm, 1-1/2-16 UNF / M95, main return/LP guard) with duty (fuel cellulose / hyd glass-fiber), micron, and seal choice. Cross to TCM 26267-67002 (FC-2703 hyd trim) and common FC-series OEM patterns available on request — provide machine model and existing part number for confirmation.

All dimensions nominal; confirm thread (1-14 UNS vs. 1-1/4-12 vs. 1-1/2-16), gasket (69/59 vs. 105/94 for 2703), and head pressure class against your actual filter head before installation.