LeeBoy 685D - Hydraulic Test Ports

Hydraulic Test Ports
The hydraulic test ports provide an easy and convenient
means of checking pressure for the grader’s main
hydraulic functions: (Figure 5-33) The test ports are
located inside the panel under the operator’s seat.
Relief pressures are shown at Table 5-3.
NOTE: Be sure to use the appropriate sized gauge
for pressure PSIs shown.
To check hydraulic pressure:
1. Run the engine long enough for the hydraulic oil to
warm to operating temperature. Set throttle to 1800
RPMs.
2. Connect the appropriate gauge to the port being
tested.
3. Start the engine, then check gauge for the proper
pressure reading.
4. If adjustment is needed, contact your authorized LB
Performance service center.
NOTE: Ports #2, #3 and #4 shown in the gure
and table only apply if equipped with the
optional AWD (All-Wheel Drive), there are
additional test ports.
Table 5-3. Hydraulic Test Port Relief Pressures
Item
No.
Function PSI Relief / Gauge
1 * Charge 350 PSI
2 * Forward 3800 PSI with drive at full load.
3 * Reverse 3800 PSI with drive at full load.
4 Main Manifold
1800 PSI with implement
cylinder held at stop.
5
Steering/
Brakes
2200 PSI with steering held at
lock.
6 Charge 350 PSI
7 Forward 6500 PSI with drive at full load.
8 Reverse 6500 PSI with drive at full load.
* Optional AWD only.
1 2 3
4
5 6 7 8
Figure 5-33. Hydraulic Test Ports
Maintenance
LeeBoy 685D Motor Grader5-28