Step Chains – Q 409 600
10 Maintenance of Step Band
10.2
Step Chains – Q 409 600
1
Description and Mode of Operation
Roller chains tailored to the requirements of escalators are used as step chains.
Every third chain pin is designed as a special pin for fastening the chain roller and the step axle.
The protective rollers of the step chains are made of hardened steel.
Fig. 600-01
1)
2)
3)
4)
5)
Chain pin
Protective rollers
Bushing
Inner link plates
Outer link plates
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Washington Metropolitan Area Transit Authority
Operation & Maintenance Manual
Schindler 9700™ Escalators
10-10
Step Chains – Q 409 600
10 Maintenance of Step Band
The two chains are linked exclusively via divided step axles.
Hint!
This facilitates replacement of chain rollers.
Fig. 600-02
6)
7)
8)
9)
Step chains
Chain rollers
Step axles
Connecting tube
Foggy Bottom Station
Washington Metropolitan Area Transit Authority
10)
11)
12)
13)
Step bushing
Strap
Spring clip
Screw
Operation & Maintenance Manual
Schindler 9700™ Escalators
10-11
Step Chains – Q 409 600
10 Maintenance of Step Band
The following protective measures are taken for covered and uncovered outdoor installations:
– The ball bearings are sealed with grease-filled Nilos rings (14). An O-ring (15) is inserted between the
axle (8) and the Nilos ring (14) to ensure a proper seat of the Nilos ring on the ball bearing.
– The step bushing (10) is sealed by means of an O-ring (16) (on the side of the strap) and a V-ring (17).
Fig. 600-03
10)
14)
15)
16)
17)
2
Maintenance
2.1
Lubrication
Bushing
Nilos rings 6204
O-ring 18.64 x 3.53
O-ring 23.4 x 3.53
V-ring V25A-NBR
Use the following lubricants to lubricate the step chains:
Warning: Outdoor installation & ambient temperature!
With automatic lubrication system, covered outdoor installaton and ambient temperatures
< 10 °C, only oils indicated below may be used!
Lubrication
Method
BP
ESSO
KLÜBER
MOBIL
SHELL
Mineral
oil
1
Automatic
lubrication
system
–
–
ZEPF
Synthetic
oil
Klüberoil
GEM 1-46N
–
–
UltrafitSynthex
Only use these particular, water-repellent oils.
These oils are not suited for manual lubrication.
For more detailed information, see Maintenance Instructions Q 409 924, Automatic Lubrication
System
Foggy Bottom Station
Washington Metropolitan Area Transit Authority
Operation & Maintenance Manual
Schindler 9700™ Escalators
10-12
Step Chains – Q 409 600
10 Maintenance of Step Band
2.2
Checking the Condition of Step Chain Rollers
Check for the proper seat of the plastic tire (18) on the hub (19) and the proper seat of the hub on the ball
bearing (20).
Check the step chain rollers for cracks in the plastic tires (18).
Check the running behavior of the ball bearings (20) (the ball bearings are sealed and lubricated for their
entire service life).
Fig. 600-04
18) Plastic tire
19) Hub
20) Ball bearing
Hints!
Perform the checks in the tension station; advance the step chain in the downward direction.
With defective plastic tires (18), it is clearly visible that the rollers run out vertically or
laterally.
Replace defective rollers.
See Repair Instructions Q 409 692, Step Chain Rollers
2.3
Checking the Condition of Spring Clips
Randomly check 8 to 10 spring clips for leg wear.
Min. leg width: 2.5 mm
Fig. 600-05
Foggy Bottom Station
Washington Metropolitan Area Transit Authority
Operation & Maintenance Manual
Schindler 9700™ Escalators
10-13