2014/11/14 Caterpillar

Excavator:

320E (S/N: REE1-UP; SXE1-UP; DFG1-UP; TNJ1-UP; LAK1-UP; WBK1-UP; PNL1-UP; LHN1-UP; AWS1-UP; KLT1-UP; MEW1-UP; SHX1-UP; TEX1-UP; TFX1-UP; NAZ1-UP)

323E (S/N: RAP1-UP; YRP1-UP; TDW1-UP)

324E (S/N: KTE1-UP; TLF1-UP; LDG1-UP; PNW1-UP; JCZ1-UP)

329E (S/N: RLD1-UP; ZCD1-UP; WJK1-UP; TST1-UP; PLW1-UP; RDX1-UP; PTY1-UP)

336E (S/N: JEA1-UP; RZA1-UP; KED1-UP; YCE1-UP; TEG1-UP; BMH1-UP; FJH1-UP; GTJ1-UP; JRJ1-UP; SSL1-UP; YEP1-UP; CMR1-UP; HDW1-UP; DPX1-UP; BZY1-UP; GNY1-UP; TMZ1-UP)

336F (S/N: TZA1-UP; RKB1-UP; YFD1-UP; KGH1-UP; NAJ1-UP; LCL1-UP; NBL1-UP; PFL1-UP; SSN1-UP; LTP1-UP; KFT1-UP; DSW1-UP; MTW1-UP; WTZ1-UP)

Mobile Hydraulic Power Unit:

320E MHPU (S/N: EGX1-UP)

329E MHPU (S/N: K2L1-UP; KNR1-UP)

336E MHPU (S/N: DSZ1-UP; T3Z1-UP)

A new slow return check valve for the boom circuit is now available for certain excavators.

The new slow return check valve improves boom STOP when the joystick is returned to the NEUTRAL position on the machines listed above. The new slow return check valve has a larger orifice to allow the spool to return to the neutral position quicker when the joystick is back to the neutral position.

Illustration 1	g03748713
Main control valve

Illustration 2	g03748721
Detail (A) Slow return check valve