Disassembly
CAUTION
1.
Plug all ports and clean the outside of the valve thor-
oughly.
Use eye protection such as goggles when using
compressed air.
IMPORTANT: Match--mark spools to their associat-
ed bores before disassembly. Spools must be rein-
stalled to the bore from which they were removed.
1.
Clean all metal parts with solvent and blow dry with
compressed air.
2.
blies from their bores.
Remove both spool caps and slide the spool assem-
2.
washers with new ones.
Replace check poppets, o--rings, and back--up
3.
sembly.
Remove o--ring and bushing from each spool as-
3.
4.
5.
Install new o--rings into the valve body.
Slide bushings and new o--rings over the spools.
If a spool was disassembled, install washer, spool
4.
ends that are opposite the spool caps.
Removewipersealsando--ringsfromthespoolbore
spring, spacer, and retaining ring to the spool.
Note:
Disassemble spool assemblies only if the re-
taining ring, spacer, spring, or washer need replacing.
6.
Lubricate spools liberally with clean hydraulic fluid
and install into their proper bore.
5.
Remove seat retaining plugs, back--up washers, o--
rings, and check springs from the valve body.
7.
20
Install spool caps into valve body. Torque caps from
to 25 ft--lb (27 to 34 N--m).
6.
Remove check poppets, seats, o--rings, and plung-
ers from the valve body.
8.
Lubricate both plungers liberally with cleanhydraulic
fluid and install into their proper bore.
7.
Remove solid plug, back--up washer, and o--ring
from the opposite end of the plunger.
9.
Installnewo--rings,seats,checkpoppets,andcheck
springs into the plunger bores.
8.
Remove plug and o--ring from the top of the valve
body next to the detent plug.
10.Install
o--rings, back--up washers, and seat retaining
plugsintotheirplungerbores.Torquebothplugsfrom30
to 35 ft--lb (41 to 48 N--m).
9.
Remove disc, spring, and detent plunger from the body.
Remove detent plug and o--ring from the valve body.
11.
into the bore with the grooved plunger. Torque plug from
30 to 35 ft--lb (41 to 48 N--m).
Install new o--ring, back--up washer, and solid plug
Inspection
1.
Inspect spools and spool bores for wear. If wear is
excessive, replace valve with new one.
12.Install
new o--ring, seat, check poppet, check spring,
2.
3.
Inspect springs and replace as necessary.
new o--ring, back--up washer, and seat retaining plug
into the bore with the plunger. Torque plug from 30 to 35
ft--lb (41 to 48 N--m).
Inspect plunger, detent plunger, and check poppet
for wear. Replace as necessary.
13.Install
next to the detent plug bore. Torque plug from 10 to 12
ft--lb (14 to 16 N--m).
o--ring and plug into the top of the valve body
4.
as necessary.
Inspect seat, spacer, and bushing for wear. Replace
5.
6.
Inspect disc and washer. Replace as necessary.
Inspect cap and plugs for damaged threads and in-
14.Lubricate
with clean hydraulic fluid and install into its valve body
bore.
plunger detent, spring, and disc liberally
spect o--ring sealing surfaces. Replace as necessary.
15.Install
Torque plug from 30 to 42 ft--lb (41 to 57 N--m).
o--ring and detent plug into its proper bore.
Assembly
IMPORTANT: Do not wipe parts with dry paper tow-
els or rags. Lint may cause damage to the hydraulic
system.
Hydraulic System (Rev. D)
Page 4 -- 92
Groundsmaster 3500--D
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