51
This CH Series hoist is supplied with our Braden 1-1/2”
brake valve. It is a reliable hydraulic valve with internal
components manufactured to close tolerances. Due to
these close tolerances, several individual parts are not
available as replacement parts and are noted in the fol-
lowing parts lists as NSS (Not Serviced Separately).
Before disassembling the brake valve, be sure you
have conducted all applicable troubleshooting opera-
tions and are certain the brake valve is causing the mal-
function.
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 compo-
nents.
BRAKE VALVE SERVICE
1 1/2 INCH BRAKE VALVE
ITEM
DESCRIPTION
QTY.
1
Valve Housing (NSS)
1
2
Check Valve Retainer (NSS)
1
3
Spring Retainer (NSS)
1
4
Plug (NSS)
1
5
Spool (NSS)
1
6
Damper Piston (NSS)
1
7
Damper Piston Extension
1
8
Check Valve Poppet (NSS)
1
10
Reducer
1
11
Check Ball
1
12
Check Valve Spring
1
13
Main Piston Spring
1
14
O-Ring
1
15
Back-up Ring
1
16
O-Ring
1
17
Back-up Ring
1
18
O-Ring
1
19
Pipe Plug
1
20
Check Spring
1
21
Shim
as req'd
22
Spring Seat
1
19
4
20
11
19
10
12
2
1
14
19
4
5
15
18
17
16
21
3
13
14
6
7
8
22
0
11
19
10
1 1/2 inch brake valves built after mid-March 1997 con-
tain a spring seat (item 22) between the spool spring
and the spool. This provides a slightly larger, more uni-
form area for the spring to seat against the spool. The
result is increased spring service life and improved
repeatability of pressure/flow modulation over the full
compression range of the spring.
The spring retainer has been modified to allow for the
additional thickness of the spring seat and a groove
machined into the hex end cap serves as a visual indi-
cation that the valve contains the new spring seat. The
spring seat improvement may be added to earlier brake
valves by installing kit, Part Number 62805. Items 3, 7,
13, 14 and 22 are included in the kit. We recommend
that this kit be installed whenever the brake valve is
removed for inspection or service.
It is always a good practice to check the initial opening
or “cracking” pressure of the brake valve whenever the
hoist is serviced or inspected. Refer to Braden Service
Bulletin 527 for complete brake valve test and adjust-
ment procedures.
