Jet JTX-2748A, Руководство по эксплуатации, Страница: 6 / 12

6
6.0 Operation
To lift a load:

Lower forks to lowest position.

Insert forks under load or into pallet.

Push the lever down.

Pump handle up and down until forks
reach desired height.
To move a load:

Place lever in center neutral position.

Pull or push to desired location.
To lower a load:

Pull lever up, and allow load to settle.
(The lever is spring loaded and will return
to neutral position when released.)

Pull forks away from load.
7.0 Maintenance
7.1 Lubrication
Check the oil level annually by unscrewing oil
fill plug (Figure 7-1). Oil level should be near
the bottom of the hole.
When adding oil, fill the reservoir through the
plug hole with hydraulic jack oil, until oil
comes to bottom of hole, or begins to slightly
seep out of the fill hole. Do not overfill.
After filling, reinstall plug, then bleed the pump
(see
sect. 8.3 ).
Lubricate pivot points on load wheel frames,
as needed. Do not get oil directly on load
wheels.
Also lubricate pivot points on the yoke, such
as the one shown in Figure 7-1.
Figure 7-1
7.2 Cleaning relief valve
(“Bleeding the Pump”)
Over time the relief valve assembly may
become clogged with debris or develop air
pockets. This can result in improper lifting,
lifting only half-way, or similar symptoms.
To clean the relief valve:

Hold lever in raised position (fork lowering
position) and pump handle quickly 10 to
12 times.

Move lever to lower position, and pump
the handle to raise forks to fullest height.

Repeat if necessary.
7.3 Adjusting relief cam

Place handle lever in neutral position.

Loosen #424 hex nut.

Adjust #423 socket set screw while
pumping the handle.

The cam is properly adjusted when
pumping handle in neutral position causes
no movement.

Re-tighten hex nut (#424) to secure the
setting.
7.4 O-Ring and seal replacements
IMPORTANT: Repairs and seal ring
replacements should be performed only by
qualified personnel. Also, certain procedures
may require specialized tools. You can locate
the nearest authorized JET Service Center on
our website: www.jettools.com.
Numbers in parentheses refer to index
numbers in the parts breakdowns,
sect. 10.0 .
7.4.1 Ram piston and plunger piston

Raise the forks to maximum height by
pumping handle.

Remove the socket head screw (#204) to
release the piston assembly from the top
of the frame.

Turn the pallet truck on its side. Remove
the steer wheels and wheel shaft.
Remove the Retaining Ring (#305). This
will free the pump and handle assembly
from the platform.

Turn the pallet truck upright. Remove
drain plug (see Figure 7-1) and empty the
oil into a suitable container. Pump handle
until all oil has drained.