JLG 266 LoPro Service Manual - Manual (Page 75)

8.5 266, 307, 266 LoPro
Hydraulic System
8.5.2 Main Control Valve Pressure Checking
Attach 345 bar (5000 psi) gauge to the test port (1) on the
main control valve port to check the system pressure.
The main control valve pressure should be 250 ± 5 bar
(3600 psi) at full throttle.
8.5.3 Charge Pressure Checking
Attach a pressure gauge to the test port (2) on the
hydrostatic transmission to check the system pressure.
The pressure should be 25 to 28 bar (362 to 406 psi) with
the engine at idle.
Do NOT adjust any relief settings. The unit is preset at the
factory and should not be tampered with. If the proper
pressure is not read, the unit may be defective.
8.5.4 Drive Pressure Checking
Attach a pressure gauge to the test fitting (3) on the
hydrostatic transmission to check the system pressure.
Check the drive pressure with the park brake on and the
service brake off at full throttle. The pressure reading
should be 440 to 460 bar (6381 to 6671 psi).
Do NOT adjust any relief settings. The unit is preset at the
factory and should not be tampered with. If the proper
pressure is not read, the unit may be defective.
8.5.5 Steering Pressure Checking
Attach a pressure gauge to the test fitting (4) on the
appropriate hose of the implement pump. The pressure
reading should be 180 bar (2610 psi) with the steering
wheel fully turned to one direction.
Do NOT adjust any relief settings. The unit is preset at the
factory and should not be tampered with. If the proper
pressure is not read, the unit may be defective.
8.5.6 Brake Pressure Checking
Attach a pressure gauge to the test fitting (5) on the brake
valve in the cab to check system pressure. The pressure
reading should be 30 bar (435 psi) with the brake pedal
fully depressed.
Do NOT adjust any relief settings. The unit is preset at the
factory and should not be tampered with. If the proper
pressure is not read, the unit may be defective.
MAH0120
1
MAH0780
2
3
MAH0850
4
MAH0030
5