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Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 93
Disassembly
1. Plug all ports and clean outside of valve thoroughly.
2. Remove caps (9). Do not remove retaining rings (12)
from spools unless spring (19) is broken.
NOTE: Spools and spool bores are matched sets. Be
sure each spool is identified with the correct body spool
bore.
3. Remove spools (35) from 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), springs (30), poppets (1), seats
(4) and plungers (28 and 33).
7. Remove plug (17).
8. Remove plug (23), disc (27), spring (21) and detent
plunger (22).
9. Remove relief plug assembly (32), washers (13, 14,
and 15), spring (31) and poppet (10).
10.Remove all O--rings and back--up rings fromall 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.
5. Inspectr elief valvepoppet (10)for breakage or wear.
Assembly
1. Thoroughly clean and dry allparts. Apply a lightcoat-
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--r ing (24).
10.If retaining ring (12) has been removed to replace
spool spring (19), install washer (16), spring (19),
spacer (2), and 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 oiland install spool assemblies
into proper location of body.
12.Install spool caps (9) and tighten from 20 to 25 ft--lb
(27to33N--m).
13.Install new wiper seals ( 3).
Hydraulic
System