Toro Groundsmaster 455-D Service Manual page 133

7. Remove plugs (Item 6).
8. Remove plugs (Item 1), disks (Item 2), springs
(Item 3) and detent plungers (Item 4).
9. Remove locknut (Item 14), washer (Item 15), plug
(Item 16), washers (Item 18, 19, 20), spring (Item 21)
and poppet (Item 22).
IMPORTANT: Do not remove seat (Item 23). Seat has
been set to a predetermined depth and locked
in place.
10. Remove all o-rings and back-up rings from all plugs
and seats.
Inspection of Lift Valve
1. Remove all nicks and burrs from parts and inspect for
excessive wear.
2. Inspect all plungers and poppet seats for burrs or
roughness.
3. Inspect spool springs (Item 27), Relief valve spring
(Item 21), lockout springs (Item 33) and detent springs
(Item 3) for breakage.
4. If spools have excessive wear, the valve becomes
non-serviceable as the spools and spool bores are
matched and damaged spools cannot be replaced.
5. Inspect relief valve poppet (Item 22) for breakage
or wear.
Assembly of Lift Valve
1. Thoroughly clean and dry all parts. Apply a light
coating 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.
®
Groundsmaster 455-D
2. Install new o-rings (Item 12) in proper grooves in
spool bores.
3. Install relief valve components (Items 22, 21, 20, 19,
18) with new o-ring (Item 17) on plug (Item 16).
4. Install plugs (Item 11) with new back-up washers
(Item 10) and o-rings (Item 9).
5. Install plungers (Item 37, 31).
IMPORTANT: Check location and positioning of
plungers during installation.
6. Install new o-rings (Item 36) on seats (Item 35). Install
new back-up washers (Item 10) and o-rings (Item 9) on
plugs (Item 32).
7. Install seats (Item 35), new poppets (Item 34),
springs (Item 33) and plugs (Item 32).
8. Install plugs (Item 6) with new o-rings (Item 7).
9. Install detent plungers (Item 4), springs (Item 3), discs
(Item 2) and plugs (Item 1) with new o-rings (Item 5).
10. If retaining ring (Item 29) has been removed to
replace spool spring (Item 27), install washer (Item 26),
spring (Item 27), spacer (Item 28) and secure with
retaining ring (Item 29).
11. Slide bushings (Item 25) over spools. Slide new
o-rings (Item 12) over spools and position next to bush ­
ings. Dip spools in clean hydraulic oil and install spool
assemblies in proper location.
12. Install spool caps (Item 30) and tighten to a torque
of 20 - 25 ft-lb.
13. Install new wiper seals (Item 24).
Page 4 - 49 Repairs