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The 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
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 orifi ce (9) from the brake release (BR)
port using a 5/32 in. Allen wrench.
2. Remove the plug (19) from the drain port.
3. Remove the spool spring retainer (3) and spool spring
(11). Check spring free length. Replace spring if less
than 1 15/16 in. (49.2 mm) long.
BRAKE VALVE SERVICE
1 VALVE HOUSING (NSS) 1
2 CHECK VALVE RETAINER 1
3 SPRING RETAINER 1
4PLUG 1
5 SPOOL (NSS) 1
6 DAMPER PISTON (NSS) 1
7O-RING 1
8 CHECK VALVE POPPET (NSS) 1
9 PILOT ORIFICE 1
10 CHECK VALVE SPRING 1
11 SPOOL SPRING 1
12 O-RING 2
13 O-RING 1
14 O-RING 1
15 BACK-UP RING 1
16 BACK-UP RING 1
19 PLUG 1
22 SHIM A-R
NSS - NOT SERVICED SEPARATELY. REPLACE
COMPLETE VALVE ASSEMBLY.
A-R - AS REQUIRED
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