Manifold Service (Fig. 46)
Make sure the manifold isthoroughly cleaned before
4. Connect hydraulic hoses to hydraulic fittings on
manifold.
1.
removing either of the valves.
5. Install fuel tank to machine (see Fuel Tank Installa-
tion in Chapter 3 -- Gasoline Engine or Chapter 4 -- Die-
sel Engine).
IMPORTANT: Use care when handling the hydraulic
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
6. Check hydraulic fluid level in reservoir (front axle)
and adjust as required (see Traction Unit Operator’s
Manual).
2.
Note correct location of o--rings, sealing rings and back-
up rings. Remove and discard seal kit from valves.
Using a deep socket, remove valves from manifold.
7. Follow Hydraulic System Start--up procedures.
3.
valves for damage to the sealing surfaces, damaged
threads and contamination.
Visually inspect the manifold port and removed
8. Check counterbalance valve adjustment (see Trac-
tion Unit Operator’s Manual).
A. Contamination may cause valve to stick or hang
up.Contaminationcanbecomelodgedinsmallvalve
orifices or seal areas causing valve malfunction.
2
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
25 ft--lb
3
(34
N--m)
CAUTION
20
(27
ft--lb
N--m)
Use eye protection such as goggles when using
compressed air for cartridge valve cleaning.
4
4.
Clean valves by submerging valve in clean mineral
1
spirits toflush outcontamination. Particles asfine astal-
cum powder can affecttheoperation ofthevalve. Beex-
tremely careful not to damage cartridge. Use
compressed air for cleaning.
Figure 46
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.
1.
2.
Manifold
3.
Check valve
Plug
Counterbalance valve
4.
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.
Install all removed hydraulic fittings with new o--rings to
the manifold.
Coat new o--rings lightly with clean hydraulic oil.
2.
frame. Secure manifold to machine with two (2) cap
screws and flange nuts.
Position counterbalance valve manifold to machine
3.
Remove all caps or plugs from hydraulic hoses and
fittings.
Groundsmaster 3280--D/3320
Page 5 -- 59 Rev. A
Hydraulic System
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