HYDRAULIC SYSTEM
ME12002
Testing Hydraulic Pressure
Checking the Side Valve Block (PPLV-2) Pressure Setting
Overview: •
One two-step primary-pressure limiting valve for pump P1+P2 (main valve block).
•
The side valve block is supplied by pump P1 through the main valve block.
•
One primary-pressure limiting valve at the side valve block (attach: pressure adjustment).
•
Measuring points at the hydraulic pump (P1, P2) and at side valve block (P3) of the pilot oil supply unit.
MP2
MP1
Figure 3-15 Hydraulic Pump Position Measuring Points (MP1, MP2) (photo taken from underneath) MP3 P3
P2
P1
Figure 3-14 Measuring Points Testing Side Valve Block (P1) Pressure Functions: Dozer blade cylinder and boom offset cylinder. Figure 3-16 Side Valve Block Position Measuring Point (MP3) 1. Apply pressure gauge at measuring point MP1 and MP3. See Figure 3-15 and Figure 3-16. 2. Full throttle, raise the boom all the way up. 3. Increase the primary pressure limiting valve 1 setting PPLV-1 (MR) up to 5076 psi (350 bar) (main valve block - with adjustment screw e1 at the main relief valve).
909768/BP1207
64
Printed in U.S.A
