Anthony Liftgates MTU-GLR Series, Руководство по обслуживанию

Страница: 14 / 24

Anthony Liftgates, Inc.
14
MTU-GLR Maintenance
www.anthonyliftgates.com 800-482-0003
4.10 Replacing Solenoid Valve
ALI-00594
1. While installed in the pump, remove nut (1).
2. Remove coil (2) from cartridge (3).
3. Remove cartridge (3) from pump body.
4. O-ring (4) is not required on current models and can
be discarded.
4.11 Checking Cylinder Piston Seals
(drifting - caused by seal leakage)
Power Down Models
1. Check the lowering valve. Make sure it is operating
correctly, and the valve is not sticking or dirty. Refer
to “4.8 Checking Lowering Valve Cartridge and
Solenoid” on page 13.
2. If the lowering valve is operating properly, then the
drifting is most likely caused by worn piston seals.
Replace the cylinder.
4.12 Checking System Pressure
For gravity down systems, there is only one relief valve
(power up). Power down models have two relief valve
settings; one for raising the platform (power up) and one
for lowering the platform (power down).
To check the “power up” pressure setting:
1. Place the liftgate on the ground and remove the
pressure hose from the power up port of the pump.
2. Install a T-fitting (customer supplied) into the power
up port.
3. Connect a pressure gauge and reconnect the
hydraulic hose.
The pressure gauge must be rated above the
maximum pressure of the liftgate. For example, use
a 4000 psi pressure gauge on a 3000 psi maximum
capacity liftgate.
4. Raise the liftgate and check the pressure on the
gauge.
Low Pressure Threshold Chart
Model Power Up Power Down Cylinder Part
Number
2500 2300 psi 350 psi A-130113
3000 2750 psi 350 psi A-130113
4000 1700 psi 175 psi A-130114
5000 2125 psi 175 psi A-130114
6000 2550 psi 175 psi A-103114
WARNING
Do not stand or work in
the platform’s work area
while operating the
liftgate. Place the pressure gauge so it can be read
while operating the liftgate from a safe location.
Serious injury or death could result if this action is not
followed.
5. Check the power down relief valve pressure in the
same way as the gravity down system by installing a
T-fitting and pressure gauge.
4.13 Checking Flow Control Valve
ALI-00595
If the cylinder does not operate or operates slower than
normal, remove the flow control valve and hook the
hydraulic hose directly to the cylinder. If the cylinder
operates properly, replace the flow control valve.
WARNING
Do not operate the liftgate
without the flow control
valve. Serious injury or
death could result if this action is not followed.