HYDRAULIC EQUIPMENT MAINTENANCE STANDARD
50-22 EX20 Series
HYDRAULIC EQUIPMENT
CONTROL VALVE
Measuring control valve relief pressure
(1) Remove the plug (control valve body, left side) and install a pressure gauge.
(2) Raise the forks to the maximum lifting height, and measure the oil pressure when the circuit is relieved.
Relief pressure
21.58 MPa {220 kgf/cm
2
}
Symbol Inspection item
Judgement standard
Remedy
Standard size (mm) Repair limit (mm)
A
(20)
Return spring
Free length 57 {2.24 in} 55 {2.16 in}
Replace
Installed length 35.8 {1.40 in} –
Install load 16.9 kg 15–19 kg
B
(13)
Tilt lock spring
Free length 70 {2.75 in} 67 {2.64 in }
Installed length 64 {2.52 in} –
Install load 5 kg 4.5–5.5 kg
C
(2)
Check valve
spring
Free length 48 {1.89 in} 44 {1.73 in}
Installed length 40.8 {1.60 in} –
Install load 1 kg 0.9–1.1 kg
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