Toro Groundsmaster 4100-D Service Manual page 135

Disassembly (Fig. 74)
1. Plug all ports and clean outside of valve thoroughly.
2. Remove spool caps (9). Do not remove retaining
rings (12) from spools unless spool spring (19) is bro-
ken.
NOTE: Spools and spool bores are matched sets. Be
sure each spool is identified with the correct valve body
spool bore.
3. Remove spools (35) from valve body (36).
4. Remove bushings (8) and O--rings (11) from spools.
5. Remove plugs (6).
IMPORTANT: Check location and positioning of
plungers when removing from body to assure prop-
er assembly.
6. Remove plugs (29), lockout springs (30), poppets
(1), seats (4) and plungers (28 and 33).
7. Remove plug (17).
8. Remove detent plug (23), disc (27), detent spring
(21) and detent plunger (22).
9. Remove relief plug assembly (32), washers (13, 14,
and 15), relief valve spring (31), and relief valve poppet
(10).
10.Remove all O--rings and back--up rings from all plugs
and seats.
Inspection
1. Remove all nicks and burns from parts and inspect
for excessive wear.
2. Inspect all plungers and poppet seats for burrs or
roughness.
3. Inspect spool springs (19), relief valve spring (31),
lockout springs (30), and detent spring (21) for break-
age.
4. If spools (35) have excessive wear, the control valve
becomes non--serviceable as the spools and spool
bores are matched. Damaged spools cannot be re-
placed individually.
5. Inspect relief valve poppet (10) for breakage or wear.
Groundsmaster 4100--D
Assembly (Fig. 74)
1. Thoroughly clean and dry all parts. Apply a light coat-
ing of clean hydraulic oil to parts prior to assembly.
NOTE: All O--rings, back--up washers, wiper seals, and
nylon poppets should be replaced as new items.
2. Install new O--rings (11) in proper grooves in spool
bores.
3. Install relief valve components (13, 14, 15, 31, and
10) with new O--ring (34) on plug assembly (32).
4. Install plugs (6) with new back--up washers (20) and
O--rings (7).
5. Install plungers (33 and 28).
IMPORTANT: Check location and positioning of
plungers during installation.
6. Install new O--rings (5) on seats (4). Install new
back--up washers (26) and O--rings (25) on plugs (29).
7. Install seats (4), new poppets (1), and plugs (29).
8. Install plug (17) with new O--ring (18).
9. Install detent plunger (22), spring (21), disc (27), and
plug (23) with new O--ring (24).
10.If retaining ring (12) has been removed to replace
spool spring (19), install washer (16), spring (19), and
spacer (2) on spool. Secure with retaining ring (12).
11. Slide bushings (8) over spools. Slide new O--rings
(11) over spools and position next to bushings. Dip
spools in clean hydraulic oil and install spool assemblies
into proper location of valve body.
12.Install spool caps (9) and tighten from 20 to 25 ft--lb
(27 to 33 N--m).
13.Install new wiper seals (3).
Page 4 - - 93 Hydraulic System