Pfaff Industrial 335 Guide

ADJUSTMENT MANUAL
296-12-19 307/002
Adjustment manual engl. 11.15
This adjustment manual applies to ma-
chines from the serial number 7 262 530
and software version 0435/002 onwards.
335

Reprinting, reproduction and/or translation of PFAFF adjustment manuals (including
parts thereof) is only permitted with our prior agreement and citation of the source.
PFAFF Industriesysteme und Maschinen GmbH
Hans-Geiger-Str. 12 - IG Nord
D-67661 Kaiserslautern

Table of Contents
Contents ..................................................................................Page
13 Adjustment ....................................................................................................................... 5
13.01 Tools, gauges and other accessories .................................................................................... 5
13.02 Abbreviations ......................................................................................................................... 5
13.03 Explanation of symbols.......................................................................................................... 5
13.04 Adjusting basic machine ........................................................................................................ 6
13.04.01 Feed dog position crossways to sewing direction................................................................. 6
13.04.02 Feed dog position in sewing direction ................................................................................... 7
13.04.03 Needle position to needle hole .............................................................................................. 8
13.04.04 Needle height (pre-calibrating) ............................................................................................... 9
13.04.05 Bottom and top feed sliding movement .............................................................................. 10
13.04.06 Hook-to-needle clearance, needle bar rise, needle height and needle guard ...................... 11
13.04.07 Top feed lift.......................................................................................................................... 12
13.04.08 Top feed stroke movement ................................................................................................. 13
13.04.09 Needle thread tension release............................................................................................. 14
13.04.10 Thread check spring............................................................................................................. 15
13.04.11 Bobbin winder...................................................................................................................... 16
13.04.12 Presser foot pressure .......................................................................................................... 17
13.05 Adjusting thread trimmer -900/52 .................................................................................... 18
13.05.01 Control cam (pre-calibrating) ................................................................................................ 18
13.05.02 Tripping lever height ............................................................................................................ 19
13.05.03 Feed regulator pin................................................................................................................ 20
13.05.04 Engaging solenoid................................................................................................................ 21
13.05.05 Feed regulator pin height..................................................................................................... 22
13.05.06 Front turning point of thread catcher ................................................................................... 23

Table of Contents
Contents ..................................................................................Page
13.05.07 Aligning thread catcher laterally........................................................................................... 24
13.05.08 Control cam (pre-calibrating) ................................................................................................ 25
13.05.09 Knife..................................................................................................................................... 26
13.05.10 Test cut................................................................................................................................ 27
13.06 Parameter settings ............................................................................................................. 28
13.07 Internet update of control P40 CD ...................................................................................... 28
14 Circuit Diagrams 91-191 585-95 ............................................................................ 29

Adjustment
5
13 Adjustment
Observe and comply with all instructions in the operating manual's chapter
1 Safety! In particular make sure that all safety covers are installed again
correctly after making adjustments, see chapter 1.06 Operating manual
hazard information!
Unless otherwise stated, the machine must be disconnected from the power
supply before all adjustment work!
Risk of injury due to accidental machine start-up!
Notes on adjustment
All adjustments in this manual are based on a fully assembled machine and may only be
carried out by technical staff trained for this purpose. Machine covers, which have to be
removed and replaced to carry out checks and adjustments, are not mentioned in the text.
The order of the following chapters corresponds to the most logical work sequence for
machines that have to be completely adjusted. Both the preceding and following chapters
must be observed if only specific individual work steps are carried out. Screws and nuts
indicated in brackets () are fastenings for machine parts, which must be loosened before any
adjustment and tightened again afterwards.
13.01 Tools, gauges and other accessories
O1 set of screwdrivers with knife widths from 2 to 10 mm
O1 set of wrenches with jaw widths from 7 to 14 mm
O1 set of Allen keys from 2 to 6 mm
O1 metal ruler (order no. 08-880 218-00)
ONeedle rise gauge (order no. 61-111 600-01)
OScrew clamp (order no. 61-111 600-35)
OTop feed lift gauge ( order no. 61-111 633-61)
13.02 Abbreviations
t.d.c. = top dead centre
b.d.c. = bottom dead centre
13.03 Explanation of symbols
Activities to be performed or important information in this adjustment manual are empha-
sised by symbols. The symbols used have the following meaning:
Note, information
Maintenance, repairs, adjustment, service work
(only to be carried out by technical staff)

Adjustment
6
Fig. 13 - 01
13.04 Adjusting basic machine
13.04.01 Feed dog position crossways to sewing direction
Rule
The bottom transporter should have the same clearance on the right and left in the nee-
dle plate recess.
OAdjust the bottom transporter 1 (screws 2) according to the rule.
1
2

Adjustment
7
13.04.02 Feed dog position in sewing direction
Rule
The bottom transporter 4 should have the same clearance at the front and back in the
needle plate recess in forward and reverse feed at the maximum stitch length setting.
OSet the maximum stitch length.
OPlace the clamping piece 1 (screws 2) as far as possible to the left on the clamping sur-
face 3 of the rock shaft. The left-hand screw must still be on the clamping surface.
OAdjust the bottom transporter 4 (screws 5) according to the rule.
Fig. 13 - 02
3
1
2
5
4

Adjustment
8
Fig. 13 - 03
13.04.03 Needle position to needle hole
Rule
The needle should pierce the middle of the needle hole exactly (with stitch length regulation
"0").
OUnscrew the top feed foot 1 and the presser foot 2.
OSet the stitch length to "0" and move the needle bar to t.d.c.
OInsert a new needle, loosen the screws 3, 4, 5 and 6.
OMove the needle directly over the needle hole by turning the handwheel.
OMove the needle bar frame 7 according to the rule.
OTighten the screws 3, 4 and 5.
OMove the stop 8 so that it touches the needle bar frame 7 and tighten the screw 6.
The needle bar frame 7 in the guide 9 and the top feed drive rods should move
easily.
1
2
6
5
4
9
8
7
35

Adjustment
9
Fig. 13 - 04
13.04.04 Needle height (pre-calibrating)
Rule
The clearance between the needle bar and needle plate should be 15 mm when the
needle bar is in b.d.c.
OAdjust the needle bar 1 (screw 2) without twisting according to the rule.
1
2
15 mm

Adjustment
10
13.04.05 Bottom and top feed sliding movement
Rule
The top and bottom feed should not move when the reverse-feed lever is activated with
maximum stitch length regulation and when the needle bar is in b.d.c.
OSet the maximum stitch length.
OLoosen the screws 1 only to such an extent that the eccentric 2 is difficult to turn on the
shaft.
OMove the needle to b.d.c.
OWhile retaining this position, initially position the eccentricity of the eccentric 2 to "up"
and then adjust it slightly so that it complies with the rule when the reverse-feed lever is
activated.
OTighten the screws 1.
Fig. 13 - 05
1
2

Adjustment
11
13.04.06 Hook-to-needle clearance, needle bar rise, needle height and needle guard
Rule
With the needle rise positioned 1.8 mm after b.d.c. of the needle bar and with stitch
length regulation "3":
1. The hook point should be at the needle midpoint and should have a clearance of 0.05
to 0.1 mm to the needle.
2. The upper edge of the eye of the needle should be 0.8 mm under the tip of the hook.
OSet the stitch length to "3",
OLoosen the screws 1 and 2 (screw 2 is located on the back of the machine).
OMove the needle bar to b.d.c. and slide the 1.8 mm thick feeler gauge with its cutout
tightly under the lower needle bar bearing. Move the screw clamp so that it touches the
feeler gauge and tighten it.
ORemove the feeler gauge and turn the handwheel in the direction of rotation until the
screw clamp rests on the needle bar bearing.
OAdjust the hook on the hook shaft according to rule 1
OTurn the hook according to rule 2 (readjust the needle height if necessary), see chapter
13.04.04 Needle height (pre-calibrating).
OMove the hook shaft bearing 3 until it abuts the hook and tighten the screw 2.
OMove the bevel gear 4 until it abuts the bearing 5 and tighten the screws 1.
The setting of the end play of the hook shaft and hook shaft bearing 3 is
omitted in machines with thread trimmer -900/52.
Fig. 13 - 06
12
13
5
4
0.05 - 0.1 mm
0.8 mm

Adjustment
12
13.04.07 Top feed lift
Rule
The presser foot 1 and top feed foot 2 should each lift 7.0 mm off the needle plate when
turning the handwheel at the maximum top feed lift position and when the stitch length
is set to "0".
OSet the maximum top feed lift and set the stitch length to "0".
OFit the presser foot 1.
OTurn the handwheel in the direction of rotation until the top feed foot 2 has reached its
highest point.
OTurn the crank 3 (screws 4)according to the rule.
OCarry out a check according to the rule.
Fig. 13 - 07
1
2
3
4
7 mm
7 mm

Adjustment
13
13.04.08 Top feed stroke movement
Rule
The presser foot 6 and the needle point should reach the needle plate at the same time
at maximum top feed lift if the presser foot 1 rests on the needle plate.
OLoosen the screw 1.
OSlide the lever 2 in its slotted lever until you feel it reach the upper stop (maximum top
feed lift); tighten the screw 1.
OLower the presser foot 3 onto the needle plate.
OLoosen the screws 4 until the eccentric 5 is difficult to turn.
OTurn the eccentric 5 according to the rule.
OTighten the screws 4.
OCarry out a check according to the rule.
Fig. 13 - 08
12
3
4
6
5

Adjustment
14
13.04.09 Needle thread tension release
Rule
When the presser foot is raised, both tension discs should be at least 0.5 mm apart.
ORaise the presser foot with the hand lever.
OAlign the pressure plate 1 behind the tension mounting plate 2 according to the rule.
The release pin 3 must not be loaded with effective tension.
Fig. 13 - 09
The clearance of 0.5 mm is the minimum size and may be over 1 mm with
thick types of yarn.
2
1
3
0.5 mm

Adjustment
15
Fig. 13 - 10
2
1
3
4
13.04.10 Thread check spring
OAdjust the stop 1 (screw 2) according to the rule.
OTurn the screw 3 (screw 4) to set the spring tension
The length of the thread check spring deflection may deviate slightly upwards
or downwards for reasons relating to the sewing technology.
Rule
The movement of the thread check spring 5 should be finished when the needle point
punctures the material (spring deflection = approx. 7 mm).
5
7 mm

Adjustment
16
1
2
5
Fig. 13 - 11
13.04.11 Bobbin winder
Rule
1. When the bobbin winder is switched on, the bobbin winder spindle should be moved
easily; when the bobbin winder is switched off, the friction wheel 5 must not touch
the drive wheel 1.
2. The bobbin winder should switch off automatically when the fill amount is still around
1 mm from the edge of the bobbin.
OAdjust the drive wheel 1 (screws 2)according to rule1.
OAdjust the bolt 3 (screws 4)according to rule 2.
3
4
1 mm

Adjustment
17
Fig. 13 - 12
13.04.12 Presser foot pressure
Rule
The material should be transported properly even at top sewing speed.
No pressure marks should appear on the material.
OTurn the screw 1 according to the rule.
1

Adjustment
18
13.05 Adjusting thread trimmer -900/52
Rule
The groove 4 of the control cam 2 should stand vertical under the feed regulator pin 5
when the thread lever is in b.d.c.
OLoosen the screws 1 through the hole in the machine housing.
OMove the thread lever to b.d.c.
OTurn the control cam 2 according to the rule.
OMove the control cam 2 down so that it touches the bearing 3 and tighten the accessible
screw 1.
OMake the second screw 1 accessible and tighten it.
13.05.01 Control cam (pre-calibrating)
Ensure that the stitch length is limited to 5.5 mm in all machines with thread
trimmer -900/52!
Fig. 13 - 13
2
1
2
4
3
5

Adjustment
19
13.05.02 Tripping lever height
Rule
There should be a clearance of 1.0 mm between the tripping lever 3 and the control cam
4 when the needle bar is in b.d.c.
OMove the needle bar to b.d.c.
OAdjust the carrier 1 (screws 2) of the tripping lever 3 in the elongated hole according to
the rule.
Fig. 13 - 14
1
3
2
4
1 mm

Adjustment
20
13.05.03 Feed regulator pin
Rule
The feed regulator pin 5 should be able to drop easily into the control cam track 7 when
the engaging solenoid 6 is activated when the needle bar is in b.d.c.
OMove the needle bar to b.d.c.
OActivate the field core 1 manually.
OTurn the screw 2 (nut 3) until it slightly touches the tripping lever 4.
OLoosen the screw 2 approx. half a rotation until the movement of the feed regulator pin 5
complies with the rule.
Fig. 13 - 15
1
6
3
4
2
5
7