TMS800E OPERATOR’S MANUAL
OPERATING CONTROLS AND PROCEDURES
engine speed when it is being pushed by a heavy crane. When the engine exceeds the rated governed RPM while descending a grade or downshifting at the high end of the operating range, engine overspeed can result in serious damage. On downhill operation, use the vehicle brakes and gears in combination to keep crane speed under control and the engine below rated governed RPM. The transmission has 11 forward speeds and three reverse speeds. It has a five speed front section and a three speed auxiliary section. The auxiliary section contains low and high range ratios, plus three deep reduction gears. The three lowest (LL1, LO, LL2) gear sets are used for road speed control and are not intended to be used as progressive shifts. The other four ratios are used twice, once in low range and once in high range. As with any transmission gearing, shifting depends on proper synchronization. Adhere to the following: •
Never try to force the gear lever.
•
During regular shifts, when moving the gear lever into the next gear position for engagement, the lever should be held lightly against the gear to be engaged.
•
If gears are synchronized, engagement will be made immediately.
•
If not synchronized, the flat gear teeth will rotate against each other until synchronization is reached.
•
Do not jerk the shift lever into the next gear position or try to force gear engagement.
•
If gears are out of synchronization, no amount of force is going to make the engagement before synchronization.
3.
Allow air pressure to build up.
4.
Apply the service brakes.
5.
Ensure the range control switch is down in the low position.
6.
If the crane is to be started in deep reduction (LL2 or LL1), move the deep reduction switch forward to IN (Figure 3-13).
7.
Depress the clutch pedal to the floor.
8.
Move the shift lever to the desired initial gear.
9.
Release the parking brakes.
10. Slowly release the clutch pedal and depress the foot throttle pedal.
Upshifting
CAUTION Never move the deep reduction switch or the range control switch with the shift lever in neutral while the crane is moving. 1.
To make a deep reduction switch shift from LL2 to 1st, proceed as follows. a.
Just before making the upshift, move the deep reduction switch rearward to OUT while maintaining foot throttle position.
b.
Immediately release the foot throttle pedal, depress the clutch pedal once to break torque, release the pedal to engage the clutch, allow the engine to decelerate until the shift is complete. Continue driving or upshifting. The transmission shifts from LL2 to 1st when synchronous is reached.
All shifts are made with one lever and a range control switch which is used only once during an upshift sequence, and only once during a downshift sequence. In the following instructions, it is assumed that the driver is familiar with motor trucks and tractors, and that he can coordinate the necessary movements of the shift lever and clutch pedal to make progressive and selective gear engagements in either direction, up or down.
Crane Transmission Initial Start-Up
Before moving the crane, make sure you understand the shift pattern configuration (see Figure 3-12), or see the decal in the cab.
2.
Ensure the shift lever is in neutral and the parking brake is set. Start the engine.
GROVE
To shift in low range, proceed as follows. a.
3.
Move the shift lever, double clutching, to the next desired gear position in low range (1st to 2nd to 3rd to 4th).
To shift from low (4th) to high (5th) range, proceed as follows. a.
CAUTION
1.
2.
When in the last gear position for low range and ready for the next upshift, pull the range control switch up to high and move the shift lever, double clutching, to the next higher gear position. As the shift lever passes through neutral, the transmission will automatically shift from low to high range.
CAUTION Never move the shift lever to the low speed gear position after high range preselection, or anytime the transmission is in high range.
Published 09-14-2012, Control # 132-07
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