LeeBoy 8520C - Troubleshooting Introduction; Hydraulic Test Ports Guide; Track Tension Pressure Relief Check

5-50 LeeBoy 8520C Conveyor Paver
Maintenance
Track Tension Pressure ReliefTrack Tension Pressure Relief
The hydraulic adjustment cylinders are automatic and
provide even tension on the tracks to prevent excessive
wear to the paver’s undercarriage. The track tension
main manifold is mounted on the side of the lower mani-
fold on the left side of the paver. There are two relief
cartridge vales that functyion independently with ports
for the left track (LT) and right track (RT). (Figure 5-66)
The track hydraulic pressure is set at 1200 PSI at the
track tension main manifold.
To check the relief pressure, perform the following
procedure:
1. Connect a 2000 PSI gauge in-line with either Port
LT or RT on the track tension main manifold.
2. Place a Porta Power between the front idler and
frame to release pressure on the idler.
3. Increase the Porta Power pressure until the front
idler cylinder compresses.
4. Pressure should read 1200 PSI.
5. If the pressure is not correct, remove cap on the
relief cartridge valve. Using an allen wrench, adjust
the relief cartridge valve IN for more pressure or
OUT for less pressure until the PSI gauge reads
1500 PSI.
6. When the pressure gauge reads 1200 PSI,
disconnect Porta Power and gauge.
RV1
Relief Valve
Port RT
Port LT
RV2
Relief Valve
Figure 5-66. Track Tension Main Manifold
Troubleshooting
Hydraulic Test PortsHydraulic Test Ports
The hydraulic test ports provide an easy and convenient
means of checking pressure for the ve main functions
of the paver: Forward propel (left and right sides), con-
veyors/cylinders, augers/vibrators and the generator.
(Figure 5-65)
1 2 3 4 5
Figure 5-65. Test Port
Item
No.
Function PSI Relief / Gauge
1 Cylinders
Relief set at 2400 PSI.
Use 4000 PSI gauge.
2 Conveyors
Relief set at 3400 PSI.
Use 4000 PSI gauge.
3 Augers
Relief set at 3400 PSI.
Use 4000 PSI gauge.
4
Right Forward
(and Charge)
Relief set at 3625 PSI.
Set at 350 - 390 PSI (Charge)
Use 4000 PSI gauge.
5
Left Forward
(and Charge)
Relief set at 3625 PSI.
Set at 350 - 390 PSI (Charge)
Use 4000 PSI gauge.
6 Cylinders
Relief set at 2400 PSI.
Use 4000 PSI gauge.
To check pressure:
1. Connect the appropriate gauge to the port being
tested.
2. Start the engine, then check gauge for the proper
pressure reading using the table.
3. If adjustment is needed, locate the pressure-
reducing valve on left side of main manifold.
4. Remove valve cap with an allen wrench.
5. Adjust the pressure-reducing valve clockwise for
more tension or counterclockwise for less tension.