HYDRAULICS 1.51 Test point 4 (68). (Brake circuit) This test point is located on the inlet section (PVSP) (36) of the main valve (25), on port B3. 1. Connect pressure gauge to test point 4 (68). 2. Start engine. 3. Read pressure gauge. 4. Check pressure - when operating the gauge will read the stored pressure in the accumulator. Recharge will occur at 138 +/- 5 bar (2001 +/- 72.5 psi) and stop charging sat 160 +/- 5 bar (2321 +/- 72.5 psi). NOTE: The test port will allow measurement of oil pressure in the brake charge circuit. NOTE: When other services are used, the pressure seen at this Test Point will be up to a maximum of 250 bar (3625 psi). NOTE:
For dual circuit brake machines, this reading is only accurate whilst the brakes are being charged. 36 PVSP inlet section 68 Test point Test point 5 (69). (Main system – pressure P) This test point is located on the outlet section (PVP) (26) of the main valve (25). 1. Connect pressure gauge to test point 5 (69). 2. Start engine. 3. The gauge will read the pressure raised by the pump when demanded by the boom services and will be higher than the LS pressure by 20 bar (290 psi) (stand-by). 4. Read pressure gauge. 5. Check pressure is up to 270 +/- 10 bar (3916 +/- 72.5 psi). 26 PVP outlet section 69 Test point