Two-Spool Valve Repair - Bolens DuraTrac DGT 1800 Service Manual

HYDRAULIC SYSTEM (Continued)
5100 SERIES
TRACTOR
PAGE 6·11 Rev. 3192
TWO-SPOOl VALVE REPAIR
MODELS 5117H, 5118HS & 5120H
0-RING (2 PER BORE)
Fig. 6-9
REPAIRING THE HYDRAULIC
CONTROL VALVE, (TWO
SPOOL VALVE, FIG. 6-9)
The hydraulic control valve regulates
and changes the direction of oil flow
to the hydraulic cylinder when the
control lever is actuated. "Lip Seals"
are used on the spool to provide a
seal in the bore.
Replacement lip seals are available
for the control valve. Order Bolens
part# 1754414.
DISASSEMBLY
The spool is matched to the bore in
the valve body. If the spool or valve
body is damaged, the complete valve
assembly must be replaced.
1. Remove end cap assembly.
CLEVIS END 'BRASSTOOL
2.
Remove valve spool from valve
body. Using a brass tool (shown in
Fig.
6-9)
3. Remove ·"0"-rings from valve
body. Care must be taken not to
scratch the bore and not contaminate
the bore with any foreign matter. 4.
4. Clean and dry spool with a
suitable solvent.
ASSEMBLY
1. Insert clevis end into back end of
valve body until it is even with the
back end of the "0"-ring groove on
the front of the valve body.
2. Pinch lubricated "0"-ring so it
can be inserted into body as shown.
Take care that "0"-rings are not cut or
nicked during installation.
3.
Insert part of "0"-ring into groove
and let loose. With a brass tool (as
shown in Fig.
6-9),
guide "0"-ring into
groove.
4. Rotate spool, while pushing and
pulling spool until back edge of spool
is in line with back edge of "0"-ring
groove on cap end of valve. Repeat
same procedure for installing "0"-ring
as above.
5. After the "0"-ring is installed,
push and rotate spool until edge of
spool is aligned with back surface of
casting. Re-assembly end cap
assembly.