Hydraulic Pump Reservoir; Remove; Install - Yale MPB040E Manual

1900 YRM 1018
1. MOTOR
2. ELECTRO-POPPET VALVE

REMOVE

The reservoir of the hydraulic pump unit can be re-
moved without removing the complete hydraulic unit.
The motor will also come loose, with one set of screws
holding the reservoir to the subunit to the motor.
WARNING
The capacitor in the transistor controller can hold
an electrical charge after the battery is discon-
nected. To prevent electrical shock and personal
injury, discharge the capacitor before inspecting
or repairing any component in the drive unit com-
partment. Wear safety glasses. Make certain the
battery has been disconnected. Refer to the sec-
tion Steering Mechanism 1600 YRM 1004.
CAUTION
Make certain the hydraulic cylinder is fully col-
lapsed.
NOTE: The reservoir must be lowered below the suc-
tion tube before attempting to move the reservoir away
from the lift truck. Remember the reservoir may contain
hydraulic oil. Dispose of all used oil in accordance with
local regulations.
1. Move the key to the OFF position. Disconnect the
battery.
2. Remove the drive unit compartment cover.
3. Discharge the capacitor in the transistor controller.
4. Disassemble and plug the hydraulic lines to the hy-
draulic unit.
5. Remove the four capscrews retaining the reservoir
to the hydraulic unit. Carefully remove the reservoir.
6. Clean the reservoir and the suction screen. Inspect
the screen for damage and replace if necessary.
Legend for Figure 4

Hydraulic Pump Reservoir

3. HYDRAULIC SUB UNIT
4. FILLER TANK
NOTE: On 24-volt trucks, the capscrews that hold the
reservoir to the subunit also hold the motor to the sub-
unit. When the capscrews are removed, the motor will
be resting on the subunit. When reinserting the cap-
screws, ensure that the motor is located correctly and
the coupler is seated properly.

INSTALL

1. Lubricate a new O-ring using clean hydraulic oil and
install into the pump body.
2. Align the reservoir in the proper position and install
the four capscrews to retain the reservoir to the hy-
draulic unit.
3. Install the hydraulic lines to the hydraulic unit.
4. Remove the blocks and lower the lift truck to the
floor.
5. Remove the breather and add the recommended
hydraulic oil until it reaches the full mark. Replace
the breather. If too much hydraulic oil is added, the
oil will leak from the breather during operation. If
too much oil has been added, drain or use a suction
device to remove excess oil.
6. Connect the battery. Run the pump for 5 seconds
and energize the lowering 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 hydraulic oil reaches operating
temperature. Remove the breather and check the
hydraulic oil level. 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 Reservoir
7