TM 5-3805-281-24-1
Theory of Operation
1--Left Control Valve--
17--Arm II Valve
47--Orifice and Bucket
55--Boom Up Circuit Relief
5-Spool
18--Arm Regenerative
Power Passage Lift
and Anti-Cavitation
2--Right Control Valve--
Valve (in Arm II Spool)
Check Valve
Valve
4-Spool
19--Check Valve and
48--Bucket Dump Circuit
56--Orifice and Arm II
5--Flow Combiner Valve
Orifice (in Arm II
Relief and
Power Passage Lift
6--System Relief Valve
Spool)
Anti-Cavitation Valve
Check Valve
Isolation Check Valve
20--Bypass Shut-Off Valve
49--Bucket Flow Control
57--Arm II Neutral Passage
7--System Relief Valve
21--Swing Valve
Poppet Valve
Lift Check Valve
Isolation Check Valve
22--Arm Rod End Reduced
50--Bucket Flow Control
58--Front Pump Control
8--System Relief and
Leakage Pilot Valve
Pilot Valve B
Valve
Power Boost Valve
42--Solenoid Valve
51--Boom Reduced
59--Front Pump Bypass
9--Left Propel Valve
Manifold
Leakage Pilot Valve
Shut-Off Valve Outlet
10--Right Propel Valve
43--Arm Regenerative
52--Boom Manual Lower
Port
11--Auxiliary Valve
Solenoid Valve
Release Screw
60--Bypass Shut-Off Valve
12--Bucket Valve
44--Speed Sensing
53--Boom Reduced
Pilot Port
13--Boom II Valve
Solenoid Valve
Leakage Check Valve
61--Front Pump Control
14--Boom I Valve
45--Propel Speed Change
54--Boom I Power
Valve Pilot Inlet Filter
15--Boom Regenerative
Solenoid Valve
Passage Lift Check
62--Oil Cooler Bypass
Valve (in Boom I
46--Power Boost Solenoid
Valve
Valve
Spool)
Valve
16--Arm I Valve
Continued on next page
CED,TX08227,3116
1902MAY984/6
9025
05
35
6-34
