Hydraulic Oil Filter Elements — Quick Reference (English)

Items: 390A3647P0001· DM620-00-C

1) What You Are Dealing With

Both of these are hydraulic filter items kept in your plant stock. One is a long-form manufacturer/material number, the other is a shorter model-style code. Neither should be trusted purely by its digits — the only safe authority is what is stamped or plated on the filter housing it belongs to.

2) 390A3647P0001— Long-Form Stock / Supplier Number

What it usually is

• A manufacturer’s part number or a plant ERP material number that points to a specific filter element (or, less commonly, a complete filter assembly).

  
  

• The letters and numbers alone do not tell you micron rating, seal type, or dimensions.

  
  

What you must check before fitting or ordering more

1. Go to the filter it came from and read the metal nameplate on the housing (near the pipe ports):

   • Model / series

     
     

   • Pressure rating (bar / MPa)

     
     

   • Port size (thread type or flange)

     
     

   • FLOW ARROW

     
     

   
   

2. If the old element is still there, look at:

   • Outer diameter / overall length (ruler is enough)

     
     

   • Centre-hole diameter

     
     

   • O-ring colour: black/grey = NBR, brown/red = Viton/FKM

     
     

   • Any faint print or etching on the end cap

     
     

   
   

Procurement wording (safe)

“Material / Article 390A3647P0001 — issue / reorder against the housing model stamped on the head (not by ‘looks the same’). Require supplier to state: element length, OD, centre bore, seal compound, and whether the housing bypass is ~3 bar before shipping.”

3) DM620-00-C— Shorter Model-Style Code

What the format suggests (field-level)

• DMpoints to a filter housing / element family with a size 620, often used as a pipe-mounted return guard or a kidney-loop / lube-circuit filter.

  
  

• 00usually means standard configuration (no drain cock / no heater / no magnet — or “base” option).

  
  

• Calmost always means NBR seal (black/grey) for mineral hydraulic oil.

  
  

How to confirm without guessing

• Check the housing nameplate: it should show DM620… or the equivalent family code, plus pressure bar and ports.

  
  

• Confirm the flow arrow on the head faces the correct direction (tank side / return side).

  
  

Replacement steps (short version)

1. Stop pump → open vent until pressure is zero.

   
   

2. Support the bowl → open clamp/retainer → lift element straight out.

   
   

3. Check bowl bottom for bright metal particles (wear warning).

   
   

4. Clean sealing face → thin film of clean hydraulic oil on the O-ring (nothing else).

   
   

5. Seat element square on the centre support → close vent slowly → check for leaks and ensure the ΔP indicator is green.

   
   

Procurement wording (safe)

“Code DM620-00-C — supply as exact element for housing model DM620… shown on the head nameplate, NBR seal (C), standard option (00). Confirm OD / length / centre bore before delivery.”

4) One-Line BOM Entries (Copy-Paste)

• 390A3647P0001— Filter item (long-form number) — fit / reorder only against the housing nameplate model it belongs to

  
  

• DM620-00-C— Filter element / cartridge, size 620, standard option (00), NBR seal (C) — fit only to DM620-family housing shown on the head

  
  

Rule going forward (as you requested)

No code-grammar tables, no “X = Y” breakdowns — just: what it does, what to check, how to fit, how to buy.

If you want these two locked to mm and seal type with zero brand names, send two photos for the one you are unsure about:

1. housing nameplate (ports + arrow + pressure)

   
   

2. old element upright next to a ruler

   and I will return the same clean paragraph-format card with only the fit-critical numbers filled in.