National Crane Published 10-30-2014 Control # 040-09 5-13
1400H OPERATOR AND SERVICE MANUAL SERVICE
RCL SERVICE AND MAINTENANCE
Daily maintenance of the rated capacity limiter consists of
inspecting:
1. The electrical wiring connecting the various parts of the
system. If electrical wiring is damaged, it shall be
replaced immediately.
2. If the insulation is worn on the length sensor cable or
cable guides are damaged, these parts shall be
replaced.
3. Check the anti-two-block limit switches for freedom of
movement.
4. The cable reel shall be under tension to operate
properly.
5. Check the pressure transducers at the lift cylinder and
the connecting hoses for oil leakage.
Other than correcting the problems identified in the
Malfunctions Table and replacing faulty mechanical parts
and cables, no other repairs shall be performed by nonexpert
personnel.
Operating Errors
Malfunctions in the system which are caused by range
exceedings or operating errors by the crane operator himself
are indicated on the display together with an explanation.
These error codes are E01, E02, E03, E04 and E05 and they
can normally be eliminated by the crane operator himself.
Refer to PAT manual in the book for more detail on error
codes.
ANTI-TWO-BLOCK WIRE WITH EXTERNAL
REEL
Operation
Boom is equipped with an anti-two-block utilizing a reel
on the outside of the boom. As the boom extends, the wire
pays off of the reel and is routed through a sheave on the
hoist end of the boom. The wire is then routed through roller
guides attached at the hoist end of the 2nd, 3rd and 4th of
the 4 section boom or 2nd, 3rd, 4th and extend cylinder of
the 5 section boom. A switch at the sheave case on the last
boom section controls switching of the signal.
Maintenance
In the event of a break in continuity of the anti-two-block
wire, the hydraulic portion of the system will be disabled and
make certain crane functions inoperative. Before
replacement of the wire, check for continuity loss at the anti-
two-block switch, connector damage or corrosion, and
overall system condition. Due to the environmental exposure
of the system, a thorough check of the circuit should be
performed. If the wire on the reel is determined to be faulty,
replace the wire.
Do not, under any circumstances, work at an
elevated height without using proper fall protection as
required by local, state or federal regulations.
Alternative #1
This method pulls the replacement wire through the
boom using the defective wire as the installation tool.
Special tools and equipment
• Two end-to-end electrical butt connectors
• 40 ft (12,2 m) flexible wire or light cord
1. Retract boom completely.
2. Unplug electrical connector at sheave case end of
boom.
3. Remove electrical connector from the anti-two-block
wire running to the reel.
4. Remove the capscrew, washers and nut, anchoring the
anti-two-block wire at the sheave case end of the last
section.
5. Pull the wire about 2 ft (0,6 m) out the sheave case end
of the boom.
6. Cut the thimble off of the wire.
7. Attach the 40 ft (12,2 m) length of flexible wire or light
cord to the end of the anti-two-block wire using the end-
to-end electrical butt connector.
8. Let the spring tension on the reel slowly pull the wire or
cord back through the boom.
9. Remove old wire from reel and replace with new anti-
two-block wire.
10. Route the new wire through the sheave at the hoist end
of the boom and attach the end of the anti-two-block wire
to the end of the wire routed through the boom using the
second end-to-end butt connector.
11. Draw all of the light cord or flexible wire through the
boom plus an additional length of anti-two-block wire
long enough to install the first thimble for the sheave
case end of the boom. Install thimble per instructions.
12. Attach thimble end to capscrew anchor point in sheave
case.
13. Tension extendable length of cable at anti-two-block reel
by wrapping cable around reel until proper tension is
achieved.
14. Attach the electrical connector and connect to the
switch.
15. Slowly operate the boom to make sure that the anti-two-
block wire runs freely in the boom and that the cable reel
runs properly.
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