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Functional Diagram of Auxiliary Loads
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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Functional Description of the Dual-Circuit Brake System
TM 5-2420-224-20-1
AIR SYSTEM (CONT)
Keys to Brake and Functional Diagrams
A
Hydraulic brake
G
Four-wheel drive and
DS
Pressure reservoir
B
Hydraulic control pressure
BV
Operating valves
differential lock
C
Air supply pressure
1.A
1st axle
H
Axle vent
D
Brake dual-line assist and
2.A
2nd axle
KO Indicator switch
AS
Trailer control
DE  Pressure generator
accessories
F
Control pressure - supply
N
Auxiliary load
Number
Unit
Function/Description to 1-16.1 and 1-16.2
1.1
Single-cylinder on engine
2.1
Pressure regulator
Cut-out pressure 7.35 bar (108 psi)
3.2
Antifreeze pump
Selectable
5.1
Pressure reservoir
27L supply pressure 7.35 bar (108 psi)
5.1a
Pressure reservoir
10L supply pressure 7.35 bar (108 psi)
6.1
Water separator
Standard
7.2
Overflow valve
With limited return flow
7.3
Overflow valve
Without return flow
8.2
Non-return valve
-
9.1a
Indicator, red in instrument cluster
Cut-in 5.0 bar (73.5 psi), cut-out 5.5 bar (81 psi)
9.1
Light indicator
Indicator lamp, brake fluid and parking brake
10.1
Off switch
Supply pressure tank 1
10.1a
Off switch
Supply pressure tank 2
10.2
On switch
For indicator lamps
11.2
Double pressure gauge
Supply pressure, both tanks 7.35 bar (108 psi)
15.1
Antijackknife brake valve
For trailer brake, graduated
16.1
Relay valve
For trailer brake
19.3
Tandem main brake cylinder
Dual-circuit
19.2
Fixed caliper
Disk brake, front
19.2a
Fixed caliper
Disk brake, rear
20.1a
Piston cylinder
Four-wheel shift on transmission
20.1b
Piston cylinder
Differential lock, front axle
20.1c
Piston cylinder
Differential lock, rear axle
26.5
ALB regulator
Brake force regulator (modulated via rear axle)
27.7
Brake booster
Selectable (twin chamber)
28.3
Check valve
Switchover for brake
28.3a
Check valve
Switchover, trailer operation
29.1
Pressure relief valve
For unit vent 0.35 bar (5 psi)
30.1
Safety valve
Four-wheel drive, differential lock
32.1
4/3-way valve
-
33.1
3/2-way valve
Switchover for brake booster
33.1a
3/2-way valve
Electrically actuated
33.2a
Safety valve
Vent and quick-release valve
34.1
Antifreeze reservoir
Approx. 0.5 l (1.05 pints) antifreeze
35.0
Coupling head, red
Supply (without shut-off valve)
35.1
Coupling head, yellow
Brake (without shut-off valve)
38.2
Test connection
For tire inflation connection
38.3a
Test connection, hydraulic brake
ALB-regulator, brake circuit unregulated
38.3b
Test connection, hydraulic brake
ALB-regulator, brake circuit regulated
39.1
Vent point
Hydraulic brake
45.
4/2-way valve
Trailer protection valve
45.4
Shift lever valve
Shift, intermediate speeds-main speeds
45.5
Control valve
Shift, intermediate speeds (L)-main speeds (H)
a
Protection/relay valve
For towing operation
b
Connection electrically
Indicator lamp, mechanically parking brake
c
Axle vent
Rear axle, approx. 0.4 bar (6 psi)
d
Axle vent
Front axle, approx. 0.4 bar (6 psi)
1-16.4
Change 1

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