Maxon MXT-25, Maintenance Manual

Page: 48 / 61

1
1921 Slauson
A
ve. Santa Fe Springs, CA. 90670 (800) 227-41
16 F
AX (888) 771-7713
48
FIG. 48-3
LOWER PORT
RAISE PORT
5.
Check condition of hydraulic cylinder. With the plat-
form at vehicle fl oor level, remove the hydraulic line
from the
LOWER
port on the cylinder
(FIG. 48-3)
.
Hold the control switch in the
UP
position for two
seconds while you watch for hydraulic fl uid at the
LOWER
port. A few drops of hydraulic fl uid escap-
ing the port is normal. However, if fl uid streams
out, piston seals are worn. Replace seals.
6.
If pump cannot produce 2750 psi or lift the
load capacity with a minimum of 12.6 volts
DC available, or 25.2 volts DC for 24 volt
system, the pump is worn and needs to be
replaced.
4.
With platform on the ground, remove cover for access to relief valve
(FIGS. 48-1, 48-1A, 48-2 and 48-2A)
. Hold the control switch in the “
RAISE
”
position. Adjust the relief valve until the gauge reads 2750 PSI
(FIGS. 48-1, 48-1A, 48-2 and 48-2A)
. Check if pump relief valve is dirty.
Clean or replace relief valve, if necessary. Remove gauge and reinstall relief
valve in the port. Then, reinstall cover.
LIFTGATE WILL NOT LIFT RATED CAPACITY - Continued
CHECKING 2750 PSI RELIEF VALVE
(GRAVITY DOWN POWER UNIT)
FIG. 48-1
RELIEF
VALVE
ADJUSTMENT
COVER
FIG. 48-1A
CHECKING 2750 PSI RELIEF VALVE
(POWER DOWN POWER UNIT)
FIG. 48-2
RELIEF
VALVE
ADJUSTMENT
COVER
FIG. 48-2A