Caterpillar Pneumatic compactors, PF/PS/CW

Differential fluid capacity & service interval

Caterpillar Pneumatic compactors, PF/PS/CW use differential fluid with a capacity range of 7 to 21 liters. Service intervals include 50 hours, 3 months/500 hours, 1 month/750 hours, and 12 months/1500 hours. The data covers 7 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
PF-300C, PFB (2004-2008)
  • Use: Normal
  • Capacity 15,5 liter
  • Check 1 months/ 750 hours
  • Change 12 months/ 1500 hours
PF-300C, PFB (2004-2008)
  • Use: Initial service
  • Capacity 15,5 liter
  • Change 50 hours
PS-300C, PFS (2004-2008)
  • Use: Normal
  • Capacity 15 liter
  • Check 1 months/ 750 hours
  • Change 12 months/ 1500 hours
PS-300C, PFS (2004-2008)
  • Use: Initial service
  • Capacity 15 liter
  • Change 50 hours
PF-300, 7WD (1986-1996)
  • Use: Normal
  • Capacity 7 liter
  • Check 50 hours
  • Change 3 months/ 500 hours
PS-300, 7TD (1986-1996)
  • Use: Normal
  • Capacity 7 liter
  • Check 50 hours
  • Change 3 months/ 500 hours
PS-500, 7XD (1986-2002)
  • Use: Normal
  • Capacity 21 liter
  • Check 50 hours
  • Change 3 months/ 500 hours

Additional Notes

  • The Caterpillar PF-300 (7WD, 1986-1996) and PS-300 (7TD, 1986-1996) share an identical differential fluid capacity of 7 liters, with a check interval of 50 hours and a change interval of 3 months or 500 hours under normal use conditions.
  • The PS-500 (7XD, 1986-2002) carries a 21-liter differential fluid capacity, the largest among the configurations listed, while retaining the same 50-hour check and 3-month/500-hour change intervals as the earlier 7WD and 7TD models under normal use.
  • The PF-300C/PFB (2004-2008) differential holds 15.5 liters, more than double the 7-liter capacity of the earlier PF-300 (7WD), reflecting a significant increase in differential fluid volume between the two generations.
  • Under normal use, the PF-300C/PFB (2004-2008) and PS-300C/PFS (2004-2008) both specify a check interval of 1 month or 750 hours, compared to the 50-hour check interval on the 1986-1996 models, representing a substantially extended inspection frequency.
  • The normal-use change interval for the PF-300C/PFB and PS-300C/PFS (2004-2008) is 12 months or 1500 hours, three times longer than the 3-month/500-hour interval specified for the 1986-1996 generation models.
  • Both the PF-300C/PFB and PS-300C/PFS (2004-2008) include an initial service condition requiring a differential fluid change at 50 hours, applied at the same capacity as the normal fill — 15.5 liters and 15 liters respectively — indicating a break-in flush rather than a reduced-volume procedure.
  • The PS-300C/PFS (2004-2008) differential capacity is 15 liters, slightly less than the 15.5-liter capacity of the PF-300C/PFB from the same production period, despite both models sharing identical check and change intervals under normal and initial service conditions.

Other Systems