Toro ProCore, Service Manual

Page: 51 / 122

ProCore Processor Hydraulic System Page 4 -- 23
5. Disconnect hydraulic hoses from fittings in lift relief
manifold. Allow hoses to drain into a suitable container.
Remove and discard O--rings from fittings.
6. Put caps or plugs on disconnected hoses and fittings
to prevent contamination.
7. Remove two (2) cap screws, flat washers and lock
nuts that secure lift relief manifold to machine frame.
8. Remove lift relief manifold from machine.
9. If necessary, remove hydraulic fittings from manifold
(Fig. 18). Discard any removed O--rings.
Manifold Service (Fig. 18)
NOTE: Adjustment of lift relief valves is NOT recom-
mended.
1. Make sure the manifold is thoroughly cleaned before
removing any of the cartridge valves.
IMPORTANT: Use care when handling a cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
2. Using a deep socket, remove cartridge valves from
manifold. Note correct location of all sealing and backup
rings. Remove and discard sealing and backup rings
from valves.
3. Visually inspect the manifold port and cartridge valve
for damage to the sealing surfaces, damaged threads
and contamination.
A. Contamination may cause valve to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing valve malfunction.
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
CAUTION
Use eye protection such as goggles when using
compressed air for cartridge valve cleaning.
4. Clean cartridge valves by submerging valve in clean
mineral spirits to flush out contamination. Particles as
fine as talcum powder can affect the operation of the
valve. Be extremely careful to not damage cartridge.
Use compressed air for cleaning.
5. Lubricate new cartridge valve seal kit components
with clean hydraulic oil and install on valves. The sealing
and backup rings must be arranged properly on the car-
tridge valves for proper operation and sealing.
6. Thread cartridge valves carefully into correct man-
ifold port. The valves should go in easily without binding.
Using a deep socket, torque cartridge valves to values
identified in Figure 18.
Manifold Installation (Fig. 17)
1. If fittings were removed from lift relief manifold, lubri-
cate and place new O--rings to fittings. Install fittings into
manifold and torque fittings from 60 to 74 ft--lb (82 to
100 N--m) (see Hydraulic Fitting Installation in the Gen-
eral Information section of this chapter).
2. Position lift relief manifold to frame. Install two (2) cap
screws, flat washers and lock nuts but do not fully tight-
en.
3. Remove caps and plugs from disconnected hoses
and fittings.
4. Lubricate and install new O--rings on manifold fit-
tings. Connect hydraulic hoses to fittings on manifold.
Properly tighten all connections (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
5. Secure lift relief manifold to frame by fully tightening
two (2) lock nuts.
6. Operate machine hydraulic functions slowly until air
is out of Core Processor hydraulic system.
7. Check oil level in tow vehicle hydraulic reservoir and
add correct oil if necessary.
1. Lift relief manifold
2. Raise relief valve
3. Lower relief valve
4. O--ring
5. Fitting (4 used)
6. O--ring
7. Counterbalance valve
8. Plug with O--ring
Figure 18
20 ft--lb
(27.1 N--m)
1
2
6
3
4
5
60 to 74 ft--lb
(82 to 100 N--m)
UP
7
8
(27.1 N--m)
20 ft--lb
(47 N--m)
35 ft--lb
(33.9 N--m)
25 ft--lb
Hydraulic System