1.50 HYDRAULICS System pressure checks NOTE: Only check hydraulic pressure when oil is at normal working temperature (60 ± 4°C) and with engine at fast idle (1800 rpm). Five test points are available as follows: Test point 1 (65) (main system) - load sensing side Located on the LS line from compensator valve of the main pump. 1. Connect pressure gauge to test point 1 (65). 2. Start engine. This gauge will indicate the load sensing signal required by any of the services being operated. 3. Operate any service. When a service is operated to its limit, the maximum pressure of 250 bar (3625 psi) will be maintained and the pump will ‘de- swash’. 4. Read pressure gauge. 5.
Check pressure does not exceed 250 bar (3625 psi). 3 LS pump compensator valve 65 Test point Test point 2 (66) (Park Brake Circuit) On machines up to S/No 51200317 and from S/No 51200728, the test point is located in the engine compartment, on the bulkhead above the LS pump. 1. Connect pressure gauge to test point 2 (66). 2. Start engine. 4. Read pressure gauge. 5. Check pressure is between 16 to 20 bar (232 to 290 psi). 8 Pressure reducing valve 66 Test point On machines from S/No 51200318 to 51200727 the test point 2 (66) is located to the rear of the front axle. 66 Test point