7
6.0
Operation
To lift a load:
1. Lower forks to lowest position.
2. Insert forks under load or into pallet.
3. Push the lever down.
4. Pump handle up and down until forks reach
desired height.
To move a load:
1. Place lever in center neutral position.
2. Pull or push to desired location.
To lower a load:
1. Pull lever up, and allow load to settle. (The
lever is spring loaded and will return to
neutral position when released.)
2. 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:
1. Hold lever in raised position (fork lowering
position) and pump handle quickly 10 to 12
times.
2. Move lever to lower position, and pump the
handle to raise forks to fullest height.
3. Repeat if necessary.
7.3
Adjusting relief cam
1. Place handle lever in neutral position.
2. Loosen #50 hex nut (#46 for 1636JB).
3. Adjust #49 (#45 for 1636JB) socket set
screw while pumping the handle.
4. The cam is properly adjusted when pumping
handle in neutral position causes no
movement.
5. Re-tighten hex nut #50 (#46 for 1636JB) 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
1. Raise the forks to maximum height by
pumping handle.
2. Remove #54 socket head screw (#66 for
1636JB) to release the piston assembly from
the top of the frame.
3. Turn the pallet truck on its side. Remove the
steer wheels and wheel shaft. Remove the
Retaining Ring #46 (#56 for 1636JB). This
will free the pump and handle assembly
from the platform.
4. 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.
