Manitowoc National Crane NBT40 Series Service Manual

HOIST NBT40 SERVICE MANUAL
5-8 Published 8-01-2017 Control # 287-11
removing four capscrews (Item 47). See Servicing The
Motor section on page 10 for motor and counterbalance
valve disassembly.
4. Remove the brake subassembly from the hoist by
removing eight capscrews (Item 9) holding the brake
housing to the side plate (Item 27). Reinstall two of these
capscrews into the two extra tapped holes and tighten
them evenly until the brake housing comes loose from
the side plate. See Servicing The Brake section on page
11 for brake repair.
5. Remove the side plate (Item 27) and base spacer (Item
60) by removing eleven capscrews (Items 1, 57, & 59)
and two nuts (Item 58).
6. Remove the retaining ring (Item 52). Lift the ring gear
(Item 25) out of the drum (Item 5). Remove the five pins
(Item 51) as the ring gear is lifted out. Inspect the gear
teeth in the ring gear for excessive wear and replace if
necessary. Inspect the bearing (Item 28) for signs of
pitting or spalling and if necessary, replace the bearing
and seal (Item 7-6).
7. Remove the thrust washer (Item 6) and input sun gear
(Item 8) from the input planet gearset (Item 36). Inspect
for damage and replace if needed.
8. Remove the input planet gearset (Item 36) from the
drum (Item 5). Inspect the gearset for damage.
9. Remove the thrust washer (Item 6) and output sun gear
(Item 16). Inspect for damage and replace if needed.
10. Remove the output planet gearset (Item 4) from the
cable drum. Inspect the gearset for wear and repair as
needed. See Servicing The Planetary Set section on
page 13 for disassembly and repair.
11. Remove the drum (Item 5) by lifting straight up and off of
the output shaft (Item 32). Inspect the bearing (Item 28)
for signs of spalling or pitting and, if necessary, replace
the bearing and seal (Item 7-6).
12. Inspect the retaining ring (Item 35) on the output shaft to
ensure that it is still in the groove and is not bent, and
replace if necessary.
13. Inspect the shaft (Item 32) for wear or damage and, if
necessary, remove it from the side plate (Item 29) by
removing six capscrews (Item 9).
Assembly (Refer to Figure 5-10)
Refer to Figure 5-10 and the Hoist Parts List on page 5-10 to
disassembly the hoist.
1. 1. Thoroughly clean all parts. Replace those that show
wear or damage.
2. Inspect the drum (Item 5) for structural integrity and the
gear teeth for excessive wear, then replace if necessary.
3. Attach the output shaft (Item 32) to the side plate (Item
29) with six capscrews (Item 9), making sure the vent
(Item 30) is oriented properly, then torque them to
specification (see Torque Specifications Chart on page
15 of this manual).
4. Install the retaining ring (Item 3) onto the shaft (Item 32).
5. Attach the spacer (Item 60), base (Item 56), and rod
(Item 2) to the side plate (Item 29) with eleven
capscrews (Items 1, 57, & 59) and two nuts (Item 58).
Torque to specification (see Torque Specifications Chart
on page 15 of this manual).
6. If necessary, install a new bearing (Item 28) and oil seal
(Item 7-6) into the drum.
7. Lay the unit down so that the rod (Item 2) and base (Item
56) are pointing up. Set the drum (Item 5) onto the shaft
(Item 32) being careful not to damage the seal (Item 7-
6), seating the drum on the bearing (Item 28).
8. Install the output planet gearset (Item 4) into the drum
(Item 5), making sure it’s installed correctly onto the
output shaft (Item 32).
9. Put a light coating of grease on the thrust washer (Item
6) to keep it in place. Install the thrust washer into the
output gearset (Item 4), and then insert the output sun
gear (Item 16). The slot in the sun gear must be installed
facing the output shaft.
10. Install the input planet gearset (Item 36) into the drum
(Item 5), making sure it’s installed correctly onto the
output sun gear (Item 16).
11. Put a light coating of grease on the thrust washer (Item
6) to keep it in place. Install the thrust washer into the
input gearset (Item 36), and then insert the input sun
gear (Item 8).
12. Install a new o-ring (Item 7-4) and, if necessary, a new
bearing (Item 28) and seal (Item 7-6) into the ring gear
(Item 25). Grease the o-ring and seal and install the ring
gear into the drum, making sure the pin holes are lined
up.
13. Install five pins (Item 51) between the ring gear (Item 25)
and the drum (Item 5). Then, install the retaining ring
(Item 52) into the drum.
14. Position the spacer (Item 60) and side plate (Item 27) on
top of the base (Item 56) and rod (Item 2). Attach the
side plate with eleven capscrews (Items 1, 57, & 59) and
two nuts (Item 58). Torque to specification (see
“Fasteners And Torque Values” on page 1-7 of this
manual).
15. Install the brake subassembly into the side plate (Item
27), making sure that the pilot of the brake housing
aligns with the bearing (Item 28) and seal (Item 7-6) in
the ring gear (Item 25) and that the holes for the motor
Reference Only

Manitowoc National Crane NBT40 Series Specifications

General

Brand	Manitowoc
Model	National Crane NBT40 Series
Category	Construction Equipment
Language	English