1900 YRM 1018 Hydraulic Pump
4. Remove the blocks and lower the lift truck to the
floor.
5. Remove the breather and add the recommended
hydraulic oil until the oil level reaches the full level
mark. Replace the breather. If too much hydraulic
oil is added, the oil will leak from the breather during
operation.
6. Install the battery and connect the battery. Operate
the lift truck until the hydraulic oil reaches operating
temperature. Add additional oil if necessary. Check
for hydraulic oil leaks.
7. Install the drive unit compartment cover. Test the
operation of the lift truck prior to returning the truck
to service.
Hydraulic Pump
REMOVE
1. Remove the hydraulic unit from the lift truck. Refer
to the Hydraulic Unit in this section.
2. Cleanthereservoirandpumpareatopreventcon-
taminants from entering the hydraulic system.
3. Remove the capscrews retaining the reservoir to
the hydraulic unit. Tap around the perimeter to
break the seal and separate the reservoir from the
motor assembly.
4. Remove the spring retaining screw from the suction
tube.
5. Remove the suction tube and strainer by pulling
down and out.
6. Remove the four capscrews retaining the pump to
the drive motor.
7. Disassemble the pump assembly and coupling from
the adapter.
INSTALL
NOTE: The hydraulic unit includes four separate kits as
showninFigure4.
1. Clean and lubricate all components using clean hy-
draulic oil.
2. Replace all O-rings and seals within the unit.
3. Grease the coupler and coupler cavity with the mo-
tor resting with the adapter plate up. Align the pump
mounting holes with the holes in the motor. Ensure
that the tank is seated into the motor.
4. Install the four capscrews and tighten to 13.6 to
16.3 N•m (10 to 12 lbf ft).
5. Install the O-rings into the pump cavities. Apply
grease to the return tubes. Insert tubes into pump
cavities and O-rings. Grease the suction tube and
insert into locking device with hole. Install and
tighten the spring retaining screw to secure the
suction tube.
6. Remove the retainer and replace the O-ring. Lightly
grease the O-ring before installation.
7. Align the reservoir so the hose connections will be
in the same position as they were prior to removal.
Install the four capscrews to retain the reservoir.
8. Install the hydraulic unit. Refer to Hydraulic Unit,
Install in this manual.
9. Remove the breather and fill the reservoir with the
recommended oil. See the section Capacities and
Specifications 8000 YRM 1010. Add oil until the
oil is up to the full mark. If too much oil is added,
the oil will leak from the breather during operation.
If too much oil has been added, drain the excess or
useasuctiondevicetoremovesomeoftheoil.
10. Run the pump for 5 seconds and energize the low-
ering valve at the same time so that oil gets through
the pump body and valve at 0.0 psi. Operate the
forks up and down three or four times to remove air
from the system. Operate the lift truck until the hy-
draulic oil reaches operating temperature. Remove
the breather and check the hydraulic oil level. Add
additional oil if necessary. Check for hydraulic oil
leaks.
11. Install the drive unit compartment cover. Test the
operation of the motorized hand truck before return-
ing the truck to service.
5
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