TM 5-3805-280-24-1
Theory of Operation
1--Left Control Valve
73--Swing Valve
83--Rear Pump Control
97--Right Control Valve to
(5-Spool)
74--Arm Reduced Leakage
Valve
Arm I Power Passage
2--Right Control Valve
Valve
85--Arm Regenerative
Check Valves and
(4-Spool)
75--Arm Out Circuit Relief
Valve
Restriction Orifice
56--System Relief Valve
and Anti-Cavitation
86--Arm II Neutral Passage
98--Front Pump Control
Isolation Check Valve
Valve
to Arm I Power
Valve
57--System Relief Valve
76--Plug
Passage Check Valve
100--Arm Regenerative
and Power Boost
77--Swing Lift Check Valve
87--Boom Up Circuit Relief
Circuit Check Valve
59--Flow Combiner Valve
78--Arm I Power and
Valve
101--Boom Down Circuit
Circuit Check Valve
Neutral Passage
88--Bucket Dump Circuit
Relief and
60--System Relief Valve
Check Valves (Lift
Relief Valve
Anti-Cavitation Valve
Isolation Check Valve
Checks), and
93--Flow Combiner Valve
102--Bucket Curl Circuit
64--Arm II Valve
Restriction Orifice
94--Bucket Flow Control
Relief and
65--Boom I Valve and
79--Boom II Power
Valve Pilot Valve A
Anti-Cavitation Valve
Boom Regenerative
Passage Check Valve
and B, and Poppet
103--Plug
Valve
(Lift Check)
Valve
104--Arm In Circuit Relief
66--Boom Reduced
80--Auxiliary Power
95--Bucket Check Valve
and Anti-Cavitation
Leakage Valve
Passage Check Valve
(Lift Check)
Valve
67--Bucket Valve
(Lift Check)
96--Boom I Power and
105--Control Valve Circuits
68--Right Propel Valve
81--Propel Flow Control
Neutral Passage
69--Left Propel Valve
Valve
Check Valves (Lift
70--Auxiliary Valve
82--Propel Power and
Checks)
71--Boom II Valve
Neutral Passage
71A--Propel-Boom Down
Check Valves (Lift
Selector Valve
Checks)
72--Arm I Valve
9025
05
37
TX,9025,GG2610 1920MAY982/2
6-35