Paccar Braden PD12C - Brake Valve Service; Disassembly

51
BRAKE VALVE SERVICE
A
A
SEC. A-A
DRAIN
PORT
3
1
2
4
5
6
14
16
11
12
10
7
8
9
13
15
18
17
19
“BR”
PORT
22
The BRADEN brake valve is a reliable hydraulic valve with
internal components manufactured to close tolerances.
Due to the close tolerances and mating of components,
the valve housing, spool, piston and check poppet are not
available separately as replacement parts.
Before disassembling the brake valve, be sure you have
conducted all applicable troubleshooting operations and
are certain the brake valve is causing the malfunction.
Thoroughly clean the outside surfaces of the valve and
work in a clean dust free area, as cleanliness is of utmost
importance when servicing hydraulic components.
DISASSEMBLY
1. Remove the pilot orice from the brake release (BR)
port using a 5/32 in. Allen wrench.
2. Remove the elbow tting, motor drain check ball and
spring.
3. Remove the spool spring retainer and spool spring.
Check spring free length. Replace spring if less than 1
15/16 in. (49.2 mm) long.
ITEM DESCRIPTION QTY
1 BRAKE VALVE HOUSING NSS
2 VALVE SPRING RETAINER 1
3 SPRING RETAINER 1
4 PLUG 1
5 SPOOL NSS
6 DAMPER PISTON NSS
7 O-RING 2
8 CHECK VALVE POPPET NSS
9 PILOT ORIFICE 1
10 CHECK VALVE SPRING 1
11 SPOOL SPRING 1
12 O-RING 1
13 O-RING 1
14 O-RING 1
15 BACK-UP RING 1
16 BACK-UP RING 1
17 STEEL BALL 1
18 COMPRESSION SPRING 1
19 ELBOW FITTING 1
22 SHIM, VALVE SPRING AR
NSS - NOT SOLD SEPARATELY - REPLACE
COMPLETE VALVE ASSEMBLY
AR - AS REQUIRED