Toro Groundsmaster 3280-D Service Manual page 105

Manifold Service (Fig. 46)
1. Make sure the manifold is thoroughly cleaned before
removing either of the valves.
IMPORTANT: Use care when handling the hydraulic
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
2. Using a deep socket, remove valves from manifold.
Note correct location of o--rings, sealing rings and back-
up rings. Remove and discard seal kit from valves.
3. Visually inspect the manifold port and removed
valves 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 valves by submerging valve in clean mineral
spirits to flush out contamination. Particles as fine as tal-
cum powder can affect the operation of the valve. Be ex-
tremely careful not to damage cartridge. Use
compressed air for cleaning.
5. Lubricate new valve seal kit components with clean
hydraulic oil and install on valves. The o--rings, sealing
rings and backup rings must be arranged properly on
the valves for proper operation and sealing.
6. Thread valves carefully into correct manifold port.
The valves should go in easily without binding. Using a
deep socket, torque valves to values identified in Figure
46.
Installation (Fig. 45)
1. Coat new o--rings lightly with clean hydraulic oil.
Install all removed hydraulic fittings with new o--rings to
the manifold.
2. Position counterbalance valve manifold to machine
frame. Secure manifold to machine with two (2) cap
screws and flange nuts.
3. Remove all caps or plugs from hydraulic hoses and
fittings.
Groundsmaster 3280--D/3320
4. Connect hydraulic hoses to hydraulic fittings on
manifold.
5. Install fuel tank to machine (see Fuel Tank Installa-
tion in Chapter 3 -- Gasoline Engine or Chapter 4 -- Die-
sel Engine).
6. Check hydraulic fluid level in reservoir (front axle)
and adjust as required (see Traction Unit Operator's
Manual).
7. Follow Hydraulic System Start--up procedures.
8. Check counterbalance valve adjustment (see Trac-
tion Unit Operator's Manual).
2
25 ft- -lb
(34 N- -m)
1
1. Manifold
2. Counterbalance valve
Rev. A
Page 5 - - 59
3
20 ft- -lb
(27 N- -m)
4
Figure 46
3. Check valve
4. Plug
Hydraulic System