7-S5
F2880, F3680, RCK72-F36, RCK72R-F36, RCK60-F36, RCK60R-F36, WSM
HYDRAULIC SYSTEM
Flow Priority Valve Test
■
• Before flow priority valve testing, perform the “Flowmeter
Connecting and Test Preparation”. (See page 7-S4.)
1. Open the loading valve completely.
2. Start the engine and set at approx. 2700 min
-1
(rpm).
3. Read and note the flow priority valve delivery at no pressure.
4. Slowly close the loading valve to increase pressure approx. 7.8
MPa (80 kgf/cm
2
, 1138 psi).
5. Read and note the flow priority valve delivery at rated pressure.
6. Open the loading valve and stop the engine.
7. If the flow priority valve delivery does not reach the allowable
limit, check the pump suction line, oil filter or hydraulic pump.
(Condition)
• Engine speed ..... Approx. 2700 min
-1
(rpm)
• Rated pressure ..... 7.8 MPa (80 kgf/cm
2
, 1138 psi)
W1012525
(2) Hydraulic Cylinder Assembly
Relief Valve Setting Pressure
1. Remove the seat assembly and plate.
2. Remove the plug (1) from rear of hydraulic cylinder block.
3. Install the adaptor 58. Then connect the cable and pressure
gauge to adaptor 58.
4. Reinstall the seat assembly.
5. Start the engine and set a maximum speed.
6. Move the mower lift lever all way up to operate the relief valve
and read the gauge.
7. If the pressure is not within the factory specifications, adjust with
the adjusting shims (3).
(Reference)
• Thickness of shims (3) : 0.1 mm (0.0039 in.), 0.2 mm (0.0079 in.)
W1012745
Flow priority valve
delivery (PF port) at no
pressure
(Oil temperature at 50
°C (122 °F))
Factory spec.
10.0 L/min.
Above 2.6 U.S.GPM
2.2 Imp.GPM
Flow priority valve
delivery (PF port) at
rated pressure
(Oil temperature at 50
°C (122 °F))
Factory spec.
10.0 L/min.
Above 2.6 U.S.GPM
2.2 Imp.GPM
Allowable limit
9.5 L/min.
2.5 U.S.GPM
2.1 Imp.GPM
Relief valve setting
pressure
Factory spec.
13.8 to 14.2 MPa
140 to 145 kgf/cm
2
1992 to 2062 psi
(1) Plug
(2) Lowering Speed Adjusting Rod
(3) Shim
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