Big Joe PTE 30 Series, Operation, Maintenance, Repair Parts List, Page: 53 / 96

901467 9-5
required, add hydraulic oil to bring to proper level.
Use hydraulic oil listed in
Table 3-2 .
18. Reinstall breather (12).
19. Install covers (7 and 10, Figure 9-1 ) and secure
with four screws (9) and two screws (8).
9-2.5. Hydraulic Pressure Adjustment
The relief valve is factory set to open at the rated pres-
sure setting for the pump (not to exceed 2,600 psi) and
rarely needs adjusting. If you suspect that the relief
valve is malfunctioning, perform the following proce-
dures:
1. Lower forks as far as they will go.
2. Remove four screws (9, Figure 9-1 ), two screws
(8) and covers (7 and 10).
3. Disconnect hose (1, Figure 9-2 ) from valve (21)
and connect a pressure gauge of adequate range
(0-3000 psi) in its place.
4. Activate pump motor and observe reading on
pressure gauge. If pressure reading is 2,600 psi,
the relief valve is functioning properly and does
not need adjustment. If pressure reading is not
2,600 psi, proceed as follows to adjust relief
valve:
CAUTION: Do not set pressure too high or hydraulic
system may be damaged. Factory rec-
ommended setting of 2,600 psi should
be observed. Under no circumstances
should pressure be set above 2,600 psi,
5. Remove nut (29, Figure 12-17 ) to gain access to
adjusting bolt (27). With pump motor running,
observe pressure gauge and set pressure to
2,600 psi
by turning adjusting bolt clockwise to
increase pressure or counterclockwise to
decrease pressure.
6. Deactivate pump motor, disconnect pressure
gauge, and reconnect hose (1,
Figure 9-2 ).
7. Fill hydraulic reservoir by removing breather (12).
Use approved Big Joe hydraulic fluid.
8. Reinstall breather (12).
9. Bleed air from the hydraulic system by repeatedly
raising and lowering lift truck until action is
smooth.
10. Refill the hydraulic reservoir.
11. Install covers (7 and 10, Figure 9-1 ) and secure
with four screws (9) and two screws (8).