Disassembly (Figs. 48 and 49)
Plug all ports and clean the outside of the valve thor-
Assembly (Figs. 48 and 49)
1.
IMPORTANT: Do not wipe parts dry with paper tow-
els or rags. Lint free cloth must be used to prevent
lint from causing damage to the hydraulic system.
oughly.
2.
Remove spool cap (item 10) and slide the spool as-
sembly from its bore.
CAUTION
3.
Remove o--ring (item 12) and bushing (item 8) from
the spool assembly.
Use eye protection such as goggles when using
compressed air.
4.
site the spool cap.
Remove o--ring from the spool bore end that is oppo-
1.
compressed air.
Clean all metal parts with solvent and blow dry with
NOTE: Disassemble spool assembly only if the retain-
ing ring, spacer, spring or washer need replacing.
2.
back--up washers with new ones.
Replace check poppet (item 1), all o--rings and all
5.
er (item 15), o--ring (item 20) and check spring (item 9)
from the valve body.
Remove seat retaining plug (item 7), back--up wash-
3.
4.
Install new o--rings into the valve body.
6.
(item 27) and plunger (item 2) from the valve body.
Remove check poppet (item 1), seat (item 5), o--ring
Slide bushing (item 8) and new o--ring (item 12) over
the spool.
7.
26)
plunger.
Remove solid plug (item 6), back--up washer (item
and o--ring (item 25) from the opposite end of the
5.
14),
ring (item 13) to the spool.
If the spool was disassembled, install washer (item
spool spring (item 16),spacer (item3) andretaining
8.
top of the valve body next to the detent plug.
Remove plug (item 18) and o--ring (item 21) from the
6.
draulic fluid and install into its proper bore.
Lubricate spool assembly liberally with clean hy-
9.
Remove detent plug (item 19) and o--ring (item 24)
fromthevalvebody.Removedisc(item17),spring(item
and detent plunger (item 22) from the body.
7.
cap from 20 to 25 ft--lb (27 to 34 N--m).
Install spool cap (item 10) into valve body. Torque
23)
8.
Install o--ring (item 25), back--up washer (item 26)
Inspection
and solid plug (item 6) into the bore on the opposite end
of the plunger. Torque plug from 30 to 35 ft--lb (41 to 48
N--m).
1.
Inspect spool and spool bore for wear. If wear is ex-
cessive, replace lift control valve.
9.
draulic fluid and install into its valve body bore.
Lubricate plunger (item 2) liberally with clean hy-
2.
Inspect springs and replace as necessary.
3.
wear. Replace as necessary.
Inspectplunger,detentplungerandcheckpoppetfor
10.Install
pet (item 1) and check spring (item 9) into the plunger
bore.
newo--ring(item27),seat(item5),checkpop-
4.
Inspect seat, spacer and bushing for wear. Replace
as necessary.
11.
15)
bore. Torque plug from 30 to 35 ft--lb (41 to 48 N--m).
Install new o--ring (item 20), back--up washer (item
and seat retaining plug (item 7) into the plunger
5.
6.
Inspect disc and washer. Replace as necessary.
Inspect cap and plugs for damaged threads and O--
12.Install
the top of the valve body next to the detent plug bore.
Torque plug from 10 to 12 ft--lb (14 to 16 N--m).
new o--ring (item 21) and plug (item 18) into
ring sealing surfaces. Replace as necessary.
13.Lubricate
plunger detent (item 22), spring (item 23)
and disc (item 17) liberally with clean hydraulic fluid and
install into its valve body bore.
14.Install
new o--ring (item 24) and detent plug (item 19)
into its proper bore. Torque plug from 30 to 42 ft--lb (41
to 57 N--m).
Hydraulic System
Page 4 -- 76
Groundsmaster 3505--D
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