HYDRAULIC SYSTEM
ME12002
Straight Travel Spool (with additional actuation)
Figure 3-154 Straight Travel Spool (with additional actuation) While performing other operations, hydraulic fluid in pilot path (18) and spool chamber (13) pressurize. This shifts straight travel spool (305) to the left against springs (324) and (325). See Figure 3-154. Front and rear pump hydraulic fluid then flow as follows: 1. Front pump (27) hydraulic fluid flows through port (10) and then separates into two flows. One flows through parallel path (24) and into the spools of auxiliary hydraulics (310), boom 1 (303), bucket (304), and arm 2 (308). The other flows through path (5), parallel path (22) and into the spools of swing (309), arm 1 (302) and boom 2 (306). Hydraulic fluid in path (5) flows into straight travel spool (305) through path (6), check valve (7) and into center bypass (8) and center bypass (13). Both flows combine with hydraulic fluid from rear pump (28) to increase travel speed. See Figure 3-118 on page 122 for boom2 (306), Figure 3-143 on page 136 for arm 2 (308), Figure 3-146 for spool (310), Figure 3151 on page 142 for swing spool (309), boom 1 (303), bucket (304), Figure 3-154, and Figure 3-155.
2. Rear pump (28) hydraulic fluid flows through port (9) and then separates into two flows. One flows into center bypass (8) and the other flows into center bypass (15). Each flow supplies supplies hydraulic fluid to the left travel (301L) and right travel (301R) spool. See Figure 3-151 on page 142 for travel right spool (301R) and travel left spool (301L), Figure 3-154, and Figure 3-155.
Figure 3-155 Pump Flow 909768/BP1207
144
Printed in U.S.A
