Usage:
225 (51U),
225B (2ZD),
225D (2SJ),
229 (1GF),
231D (5WJ, 1NK) Excavators;
227 (10W),
Loggers;
613C (92X) Wheel Tractors
- SUPPLEMENT: 11/11/96
Service Magazine; September 30, 1996; Page 15; "Improved Sleeve Metering Fuel System (SMFS) 8.5 mm (.34 in) Fuel Pump Plunger".
Disregard this article. See the article titled "Improved Fuel Pump Plunger Helps Prevent Plunger And Sleeve Scuffing In Service 8.5 mm Fuel Injection Pump Assembly For Sleeve Metering Fuel System (SMFS) Governor And Fuel injection Pump Groups".
--------------- END SUPPLEMENT ---------------
Description of Change: Balance grooves have been added to the 8.5 mm (.34 in) fuel pump plungers in the above machines powered by 3208 Engines. The balance grooves eliminate plunger and sleeve scuffing associated with poor quality fuels. Plunger scuffing can cause governor instability due to the change in fuel delivery from one cylinder to another, or from increased sleeve to plunger friction.
View of the improved 9N-5825 8.5 mm (.34 in) Fuel Pump Plunger with the balance grooves. (1) Bypass closing port (BCP). (2) Balance groove. (3) Bypass opening port (BPO).
The balance grooves improve fuel pump life (especially with low lubricity fuels) and fuel delivery is unaffected.
Adaptable To: The 9N-5825 8.5 mm (.34 in) Fuel Pump Plunger is improved, effective with the fuel injection pump serial number (114692-Up). The improvement is adaptable to 1W-3010, 4W-5868, 7W-8040, 4P-4259, 9N-5857, 1W-3009 and 7C-8927 Fuel Injection Pump Assemblies.
View of the former 9N-5825 8.5 mm (.34 in) Fuel Pump Plunger before the improvement.