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1. 
   Catalog 37, Heavy Duty Gear Pumps, 4000 Series Product Bulletin (632KB)
2. 
   Catalog 39, Heavy Duty Gear Pumps, 4000 Series Engineering Data (2.7MB)
3. 
   NPC Series Product Bulletin (68KB)
4. 
   Sulfur Pumping Systems Bulletin (284KB)
5. 
   Bulletin 100, Installation and Trouble Analysis of 4000 Series Gear Pump (452KB)
6. 
   Bulletin 101, Instructions for Disassemble and Assembly of Northern Heavy Duty Gear Pumps, Standard Series 4400, 4500, 4600 and 4800 (860KB

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