Adjustment
11 - 10
11.04.07 Needle rise, hook clearance, needle height and needle guard on the PFAFF 491
Requirement
With the needle bar positioned 1.8 mm after BDC and the stitch length set at "0.8"
1. the hook point must be at needle centre with a hook-to-needle clearance of
0.05 to 0.1 mm;
2. the top of the needle eye must be 0.8 to 1.0 mm below the hook point;
3. the needle guard 6 must touch the needle lightly.
4
5
5
4
● Set stitch length at "0.8".
● Loosen screws 1, 2, 3, 4 and 5.
● Bring needle bar to 1.8 mm past BDC:
● Set hook point at needle centre, making sure that the needle is not deflected by needle
guard 6.
● Adjust needle height according to Requirement 2.
● Adjust hook post according to Requirement 1 and tighten screws 4.
● Making sure that there is some play in the bevel gear, tighten screws 2.
● With retaining collar 7 touching bevel gear 8 tighten screws 1.
● Screws 5 remain loosened for further adjustments.
6
0,8 - 1 mm
Fig. 11 - 07
1
2
3
7
8
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