High-Performance Hydraulic & Fuel Management Filter – Models 23518528 & 23530706

These two spin-on filter cartridges are engineered for heavy-duty engine and hydraulic auxiliary circuits on industrial engines and mobile equipment. Both follow the 1-12 UN spin-on thread standard and integrate bypass protection, making them direct-fit replacements for a wide range of OE filter heads on certain engine families (2-53, 6V-53, 6-71, 6V-71 and related series). While 23518528 carries a fuel/water-separator duty with 30 μm nominal rating, 23530706 is specified as a 25 μm hydraulic/fuel primary spin-on — together they cover the primary filtration and water-stripping needs of the same power-unit platform.

Key Features

• Spin-on canister with rolled steel shell, anti-drain-back valve, and internal bypass (setting varies by application)

  
  

• 23518528: 30 μm nominal, 99 % efficiency per SAE J1985, water-separator media pack for fuel-system duty; also suitable as a hydraulic auxiliary guard where water ingestion is a concern

  
  

• 23530706: 25 μm cellulose media, 99 % efficiency (SAE J1985), primary filtration for hydraulic loops and engine fuel circuits

  
  

• NBR gasket std.; compatible with mineral oil, diesel, and common hydraulic fluids

  
  

• Thread: 1-12 UNF spin-on, gasket OD ~86–103 mm depending on model — verify head face before install

  
  

Technical Specifications

Application Guidance

23518528 – Primary fuel filter/water separator on certain heavy-duty engine families, also deployable as a hydraulic auxiliary filter where water separation matters (e.g. marine hydraulics, wash-down environments, forestry equipment). The taller canister (227 mm) gives extra media volume for higher dirt/water load before change-out.

23530706 – Compact spin-on for the same engine platforms where space is tighter; 93 mm OD × 200 mm length suits smaller filter heads. Common on 2-53, 6-71, 6V-53 based power units and the hydraulic pilot/aux loops attached to them.

💡 Both are spin-on units — keep a strap-wrench on hand, but never swing on the canister itself. Tighten by hand until gasket contacts, then ¾ turn. Pre-fill with clean fluid when the circuit allows (hydraulic duty); for fuel duty, prime the system per engine procedure.

Fluid Compatibility

• Mineral hydraulic oil (ISO HM/HV)

  
  

• Diesel / middle-distillate fuel

  
  

• HFC water-glycol – confirm seal (NBR acceptable for mild HFC; FKM on request)

  
  

• Not for phosphate ester (HFDR) or strong solvents

  
  

Installation & Service

1. Clean the filter-head mounting face; inspect the head's O-ring groove (if present) and the new canister's gasket.

   
   

2. Spin on by hand until gasket seats, then ¾ additional turn — do not over-torque.

   
   

3. For hydraulic loops: pre-fill the canister to reduce startup starvation.

   
   

4. For fuel/water-sep duty (23518528): bleed the head per engine manual; drain the water-collector bowl if so equipped on the head.

   
   

5. Replace per OEM hour/mile interval or when ΔP indicates clogging. Log change intervals to trend dirt load.

   
   

Quality Notes

Each batch verified for:

• SAE J1985 filtration efficiency

  
  

• Burst/shell-integrity check

  
  

• Media-to-end-seal integrity (bubble-point sampling)

  
  

• Gasket hardness & compression-set check

  
  

Ordering

Quote 23518528 (30 μm, fuel/water-sep, ~227 mm) or 23530706 (25 μm, primary, ~200 mm) with quantity. Cross-reference to common OEM engine-filter numbers available on request — provide your engine family and existing OEM part number for confirmation. Seal material (NBR / FKM) can be specified if fluid duty requires.

All values nominal; confirm thread face, gasket dimensions, and pressure class against your actual filter head before installation.