Terex TS14G, Maintenance Manual

Page: 275 / 376

Section 250-0070
SM 1755 Rev1 04-04
1
BRAKING SYSTEM - Treadle Valve
SM - 3185
Port 'D' - Stop light switch - rear
Port 'E' - Supply line from front primary tank service
circuit
Port 'F' - Delivery to front service brakes
Port 'G' - Low pressure switch - front
Port 'H' - Stop light switch - front
Port 'J' - Exhaust port
OPERATION
Numbers in parentheses refer to Fig. 1.
When treadle (1) is depressed, the brake force is
transmitted through plunger (24) and spring via the
DESCRIPTION
The treadle valve is mounted alongside the accelerator
pedals and bolted to the cab floor. The treadle valve is
the left hand pedal.
The treadle valve directs and controls air to the front
brake chambers and rear relay valve which controls air
delivery to the rear brake chamber.
There are 9 ports on the treadle valve as follows:
Port 'A' - Supply line from rear primary tank service
circuit
Port 'B' - Delivery to rear service brakes
Port 'C' - Low pressure switch - rear
Fig. 1 - Cutaway View of Treadle Valve
23 - Fulcrum Pin
24 - Plunger
25 - Rubber exhaust flap
26 - Valve body
27 - Sealing ring
28 - Screw
29 - Passage
30 - Seal
31 - Valve body
32 - Exhaust passage
33 - Vavle stem 12 - Spring
13 - Spring
14 - Spring
15 - Piston Seat
16 - Valve Body
17 - Mounting Plate
18 - Rubber Spring
19 - Vent
20 - Pin & Roller
21 - Air Filter
22 - Boot 1 - Treadle
2 - Spring Seat
3 - Primary Piston
4 - Piston Seat
5 - Valve
6 - Valve Seat
7 - Hole (Air passage)
8 - Piston
9 - Spring
10 - Valve
11 - Inlet Seat
C
G
J
F
B
H
D
E
A
1
22,24
20
17
23
18
2
16
13
3
4
6
5
12
7
9
8
15
31
32
11
10
14
26
25
27
28
29
21
19
30
30
No. 1
SUPPLY PORT
No. 2
SUPPLY PORT
No. 1
DELIVERY PORT
No. 2
DELIVERY PORT
EXHAUST
33
Courtesy of Machine.Market