Toro 41188, Service Manual

Page: 93 / 353

Multi Pro 1750 Hydraulic System Page 4 − 45
Removing the Boom Control Manifold (Fig. 35)
1. Park the machine on a level surface, stop spray
pump, fully raise the spray booms, engage the parking
brake and stop the engine. Remove the key from the
ignition switch.
WARNING
Make sure that spray booms are fully raised and
resting in the boom cradles before loosening hy-
draulic lines, cartridge valves or plugs from lift
control manifold. If booms are not fully raised as
manifold components are loosened, booms may
drop unexpectedly.
CAUTION
Before disconnecting components or perform-
ing any work on hydraulic system, all pressure in
the system must be relieved (see Relieving Hy-
draulic System Pressure in this chapter).
2. Thoroughly clean hydraulic hose ends prior to dis-
connecting the hoses from boom lift control manifold.
NOTE: The ports on the control manifold are marked to
identify hydraulic hose connections. Example: P is the
pump connection port (see Hydraulic Schematic in this
chapter to identify the function of the hydraulic lines and
cartridge valves at each manifold port location).
3. Label all control manifold electrical and hydraulic
connections for assembly purposes.
4. Disconnect wire harness electrical connectors from
solenoid valve coils on lift control manifold.
5. Disconnect hydraulic hoses from fittings in lift control
manifold. Allow hoses to drain into a suitable container.
Put caps or plugs on disconnected hoses and fittings to
prevent contamination.
6. Remove two (2) flange nuts and cap screws that se-
cure boom lift control manifold to the manifold mount
plate. Remove control manifold from machine.
IMPORTANT: A flow control orifice (0.036) is placed
beneath the hydraulic fittings in control manifold
ports C1, C2, C3 and C4. If any of these fittings is re-
moved from the manifold, make sure to remove the
orifice to prevent damage or loss.
7. If necessary, remove fittings and flow control orifices
from control manifold and discard O−rings (Fig. 36).
1. Straight fitting (4)
2. O−ring
3. Orifice − 0.036” (4) 4. Straight fitting (2)
5. O−ring
6. Lift control manifold
Figure 36
1
3
4
5
2
6
1
1
20 ft−lb
(27 N−m)
25 ft−lb
(34 N−m)
3
2
Installing the Boom Control Manifold (Fig. 35)
IMPORTANT: If fitting and flow control orifice were
removed from manifold ports C1, C2, C3 or C4, place
orifice with slot toward the bottom of the port mak-
ing sure that the orifice is flat in the base of the port
before installing fitting. Manifold damage is pos-
sible if the orifice is cocked in the port.
1. If fittings were removed from control manifold, lubri-
cate and place new O−rings onto fittings. Install fittings
into control manifold port openings (Fig. 36).
2. Position boom lift control manifold to manifold mount
plate. Secure manifold to plate with two (2) cap screws
and flange nuts.
3. Remove caps and plugs from disconnected hoses
and fittings.
NOTE: Hydraulic hoses from lift cylinder rod ends
should be connected to manifold ports C2 and C4.
Hoses from lift cylinder cap end should be connected to
manifold ports C1 and C3.
4. Lubricate new O−rings and install on hose fittings. In-
stall hydraulic hoses (see Hydraulic Hose and Tube
Installation in this chapter).
5. Using labels placed during removal, connect wire
harness connectors to manifold solenoid valve coils.
6. Check fluid level in transaxle and adjust as required
(see Operator’s Manual).
Hydraulic
System