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Groundsmaster 3505--DHydraulic System Page 4 -- 76
Disassembly (Figs. 48 and 49)
1. Plug all ports and clean the outside of the valve thor-
oughly.
2. Remove spool cap (item 10) and slide the spool as-
sembly from its bore.
3. Remove o--ring (item 12) and bushing (item 8) from
the spool assembly.
4. Remove o--ring from the spool bore end that is oppo-
site the spool cap.
NOTE: Disassemble spool assembly only if the retain-
ing ring, spacer, spring or washer need replacing.
5. Remove seat retaining plug (item 7), back--up wash-
er (item 15), o--ring (item 20) and check spring (item 9)
from the valve body.
6. Remove check poppet (item 1), seat (item 5), o--ring
(item 27) and plunger (item 2) from the valve body.
7. Remove solid plug (item 6), back--up washer (item
26) and o--ring (item 25) from the opposite end of the
plunger.
8. Remove plug (item 18) and o--ring (item 21) from the
top of the valve body next to the detent plug.
9. Remove detent plug (item 19) and o--ring (item 24)
from the valvebody. Remove disc (item17), spring (item
23) and detent plunger (item 22) from the body.
Inspection
1. Inspect spool and spool bore for wear. If wear is ex-
cessive, replace lift control valve.
2. Inspect springs and replace as necessary.
3. Inspectplunger, detentplunger and checkpoppet for
wear. Replace as necessary.
4. Inspect seat, spacer and bushing for wear. Replace
as necessary.
5. Inspect disc and washer. Replace as necessary.
6. Inspect cap and plugs for damaged threads and O--
ring sealing surfaces. Replace as necessary.
Assembly (Figs. 48 and 49)
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.
CAUTION
Use eye protection such as goggles when using
compressed air.
1. Clean all metal parts with solvent and blow dry with
compressed air.
2. Replace check poppet (item 1), all o--rings and all
back--up washers with new ones.
3. Install new o--rings into the valve body.
4. Slide bushing (item 8) and new o--ring (item 12) over
the spool.
5. If the spool was disassembled, install washer (item
14), spool spring (item 16),s pacer (item3) and retaining
ring (item 13) to the spool.
6. Lubricate s pool assembly liberally with clean hy-
draulic fluid and install into its proper bore.
7. Install spool cap (item 10) into valve body. Torque
capfrom20to25ft--lb(27to34N--m).
8. Install o--ring (item 25), back--up washer (item 26)
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).
9. Lubricate plunger (item 2) liberally with clean hy-
draulic fluid and install into its valve body bore.
10.Install new o--ring (item27), seat (item5), check pop-
pet (item 1) and check spring (item 9) into the plunger
bore.
11.Install new o--ring (item 20), back--up washer (item
15) and seat retaining plug (item 7) into the plunger
bore. Torque plug from 30 to 35 ft--lb (41 to 48 N--m).
12.Install new o--ring (item 21) and plug (item 18) into
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).
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).