NOTE: Cleanliness is extremely important when
repairing hydraulic components. Work in a clean area.
Before disassembly, drain the oil, then plug the ports
and thoroughly clean the exterior. During repairs,
always protect machined surfaces.
Assembly
1.
ing of clean hydraulic oil to parts prior to assembly.
Thoroughlycleananddryallparts.Applyalightcoat-
NOTE: All O--rings, back--up washers, wiper seals and
nylon poppets should be replaced as new items.
Disassembly
2.
bores.
Install new O--rings (12) in proper grooves in spool
1.
Plug all ports and clean outside of valve thoroughly.
2.
rings (13) from spools unless spool spring (15) is bro-
ken.
Remove spool caps (10). Do not remove retaining
3.
O--rings (28). Torque plugs from 30 to 35 ft--lb (41 to 48
N--m).
Install plugs (6) with new back--up washers (29) and
NOTE: Spools and spool bores are matched sets. Be
sure each spool is identified with the correct control
valve body spool bore.
4.
and install them into their correct position in valve body.
Lubricate plungers (2 and16) withclean hydraulic oil
IMPORTANT: Check location and positioning of
plungers during installation.
3.
4.
Remove spools (4) from control valve body (11).
Remove bushings (8) and O--rings (12) from spools
5.
Install new O--rings (25) on seats (5). Install new
back--up washers (23) and O--rings (24) on plugs (7).
and O--rings from spool bores.
5.
Remove plugs (6).
6.
Lubricate seats (5) with clean hydraulic oil. Install
IMPORTANT: Check location and positioning of
plungers when removing from body to assure prop-
er assembly.
seats (5), new poppets (1), and seat retaining plugs (7).
Torque plugs from 30 to 35 ft--lb (41 to 48 N--m).
7.
Install plug (21) with new O--ring (27). Torque plug
6.
poppets (1), seats (5) and plungers (2 and 16).
Remove seat retaining plugs (7), lockout springs (9),
from 10 to 12 ft--lb (13 to 16 N--m).
8.
Lubricate detent plunger with clean hydraulic oil.
7.
8.
Remove plug (21).
Install detent plunger (17), detent spring (20), disc (19),
and detent plug (18) with new O--ring (26). Torque plug
from 4 to 5 ft--lb (5 to 7 N--m).
Remove detent plugs (18), discs (19), detent springs
and detent plungers (17).
(20)
9.
spool spring (15), install washer (14), spring (15),
spacer (3), and secure with retaining ring (13).
If retaining ring (13) has been removed to replace
9.
and seats.
RemoveallO--ringsandback--upringsfromallplugs
Inspection
10.Slide
bushings (8) over spools. Slide new O--rings
(12)
spoolsincleanhydraulicoilandinstallspoolassemblies
into proper location of body.
over spools and position next to bushings. Dip
1.
for excessive wear.
Remove all nicks and burns from parts and inspect
2.
roughness.
Inspect all plungers and poppet seats for burrs or
11.
(27
Install spool caps (10) and tighten from 20 to 25 ft--lb
to 33 N--m).
3.
detent springs (20) for breakage.
Inspect spool springs (15), lockout springs (9), and
12.Install
new wiper seals (22).
4.
If spools (4) have excessive wear, the control valve
becomes non--serviceable as the spools and spool
bores are matched. Damaged spools cannot be re-
placed.
Groundsmaster 4500--D/4700--D
Page 4 -- 101
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
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