La Marzocco GB/5s Service manual

La Marzocco Technical Bulletin #41
New Steam Wand Assembly on GB/5s and FB/80s
Dear La Marzocco Family Member,
Herewith we would like to inform you about the latest modifications on our machines:
1) Beginning with machine SN# 2487, ALL GB/5 and FB/80 models will be equipped with a new steam wand
valve assembly, inclusive of a built-in anti-suction valve. SEE IMAGE BELOW
This feature will avoid the milk suction effect caused by a pressure drop in the boiler occurring after the
frothing phase. The anti-suction valve will automatically divert the milk drops sucked through the wand and
discharge them into the drain box.
Furthermore, the new and particular shape of the
steam valve body (A.1.001.01) allows you to grasp it easily
with a wrench in order to unlock the steam wand adaptor (A.1.005) and change the wand effortlessly.

NOTE: The previous code for the old standard steam wand valve was B1.001.
In order to update a machine you need to get the kit # B1.001.X which consists in:
L192 Anti-suction valve 2 units
A.5.007
hose clamp 1 units
T.4.001 Silicon pipe 0,06 kg
B.1.001.01 New shaped steam valve 2 units
A.7.001 'T fitting for anti-suction system 1 units
L339/1 vetrotex Ø6 sheath 0,05 m
L100/D Copper washer 14X10X1,5 2 units
L292 Tube fitting 1 units
L292/R Tube fitting 1 units
5.V010 Adhesive fasteners 6 units
F.1.002.01 Drain box GB/5 1 units
The anti-suction drain pipe must be connected to the new part# F.1.002.01 drain box.
For more details please find here enclosed also the new steam valve parts catalogue.
2) Another important feature introduced with machine SN# 2487 is the PT1000
(part# E.1.005)
temperature probe also on the steam boiler, which will definitively substitute the pressure switch (see
drawing here below). This modification will also imply a CPU change which is subsequently updated to
part #
E.1.010.01.

PLEASE SEE THE DETAILED PART LIST:
1 L271 pressure switch, 56122N
2 L276 manual reset thermostat 250° (single pole)
3 L137/4 blind ferrule, 11mm
4 L130/2 nut, tube 1/4"x6mm
5 L100/1A copper washer
6 L190 vacuum breaker
7 L180/1 copper washer
8 L154/*VGB/5 *Gr steam boiler
9 F.1.004 safety valve drain tray
10 L180 pressure relief valve
11 TL09 tube steam boiler - pressostat
12 TL07/G hot water suction tube
14 C.1.036.SX
bracket for GB/5 coffee boiler - left (from
s/n 547)
16 C.1.036.DX
bracket for GB/5 coffee boiler - right (from
s/n 547)
17 T.1.060
vacuum breaker steam boiler tubing
connection
18 E.1.005 PT1000 temperature probe
21 L140 C expansion valve
22 L037/4 copper washer, drain box
23 L146 expansion valve nut
24 L037/2PGR fitting, drain box hose barb
25 L037/3 fitting, 1/4" BSPP to 1/4" BSPP
26 L037/D drain box nut
27 L037/3R break drain fitting
28 F.1.002.01 drain box (from s/n 2487)
31 L129 1/4" cross fitting nickel
32 B.3.001 teflon seal for vacuum breaker
33 F.2.019 silicon O-ring 102 70SHA
34 B.2.013 vacuum breaker O-ring shaft
Please do not hesitate to contact me for eventual clarification.
Sincerely yours,
Enrico Wurm
La Marzocco Srl
Via delle Stelline 9
20146 Milano - Italy
T. [phone]
F. [phone]
Email: [e-mail]

22 21 24 23 20
from s/n 2259
24
to s/n 2486
19a
17
17
18
19a
from s/n 2487
earlier s/n 2258
19b
18
123 4 5
6
32b
7 8 10 11 12
13 14 15
25 26
27
28 29 30 31
32a
34a
33
9
16
34b
Portaflon
coating
18
17
Steam wand assembly
12

Steam wand assembly
13
1 F.1.007 knob cover with logo tappo manop. vap. GB/5 2 A.2.008 brass nut M6 dado ot. M6 CH9x4,5 3 I.3.003 grub screw grano M6x16 brunito 4 F.1.006 steam valve knob manopola rub. vap. GB/5 5 A.1.006 mounting nut, steam valve dado 1/2" ES.24 H6 6 I.1.015 body valve screw vite M6 fermo manopola 7 A.1.001.01 steam valve body corpo rub. vap. GB/5 8 H.1.005 O-ring, steam valve shaft O-ring Viton per asta rub. vap. 9 A.1.002 steam valve shaft asta Ø8 per rub. vap.
10 F.4.001 Teflon gasket 12x9,8x1 guarnizione Teflon 12x9,8x1 11 F.3.007 stainless steel seat sede AISI 316 per rub. GB/5 12 H.2.001 seat gasket guarniz. tenuta rub. vap. GB/5 13 A.1.004 valve seal holder racc. per guarn. tenuta 14 F.3.005 spring, steam valve shaft molla per tenuta 15 H.2.002 PTFE gasket 24x19x2 guarniz. PTFE 24x19x2 16 A.1.003 rear tube connector raccordo ingr. rub vap. GB/5 17 L100/D copper washer 14x10x1,5 rondella rame 14x10x1,5 18 L192 anti-suction steam valve valvola antirisucchio per rubinetto vapore
19a B.1.001.01 inclined steam valve complete - from s/n 2259 rubinetto vapore inclinato completo - da s/n 2259 19b B.1.001 inclined steam valve complete - earlier s/n 2258 rubinetto vapore inclinato completo - fino a s/n 2258
20 B.2.013 anti-suction valve shaft asta per valvola antirisucchio 21 F.2.019 silicon O-ring 102 70SHA O-ring 102 silicone 70SHA 22 B.3.001 Teflon seal for anti-suction valve tenuta in Teflon per valvola antirisucchio
Item Part Number/Codice Description Descrizione
Lancia - Rubinetto Vapore

Steam wand wssembly
14
23 B.1.001.TR washer for anti-suction steam valve cap rondella x tappo rub. vapore c/antirisucchio 24 B.1.001.T 1/8" cap for anti-suction steam valve tappo 1/8" rub. vapore c/antirisucchio 25 L260/1A copper washer 27x21x1,5 rondella rame 27x21x1,5 26 F.3.004 steam wand sealing spring molla per tubo vap. GB/5 27 I.4.001 brass washer 14x7x0,5 rondella ottone 14x7x0,5 28 A.1.005 steam wand adaptor racc. 1/2" per tubo vap GB/5 29 H.1.004 O-ring, steam wand O-ring 3043 10,77x2,62 85 SH 30 H.2.003 steam wand sealing guarn. PTFE per snodo tubo vap. 31 H.1.003 O-ring 117 2,62x13,1 Viton 85 SH O-ring 2,62x13,1 Viton per tubo vap.
32a T.2.001 steam wand for GB/5 tubo vapore per GB/5 32b T.2.001.TF steam wand for GB/5 with Portaflon coating tubo vapore per GB/5 rivestito in Portaflon
33 L171/G rubber steam tube cover gommino antiscottat. tubo vap.
34a L173 S/S steam wand tip spruzzatore inox x tubo vapore 34b L173TF Portaflon-coated steam wand tip spruzzatore inox x tubo vapore rivestito in Portaflon
Item Part Number/Codice Description Descrizione
Lancia - Rubinetto Vapore

5
Anti-suction steam valve kit
15
4
10
7
13
1
11
12
2
3
6
4
8
9

Anti-suction steam valve kit
16
1 B.1.001.01 inclined steam valve complete - from s/n 2259 rubinetto vapore inclinato completo - da s/n 2259 2 L192 anti-suction steam valve valvola antirisucchio per rubinetto vapore 3 L100/D copper washer 14x10x1,5 rondella rame 14x10x1,5 4 T.4.001 silicon tube for anti-suction valve - specify how long tubo silicone valvola antirisucchio - specificare lunghezza 5 5.V010 adhesive fastners incollini 6 A.5.007 hose clamp fascetta 8-12 banda 8 vite zincata 7 A.7.001 T fitting for anti-suction system raccordo a T x antirisucchio 8 L292 tube fitting portagomma 9 L292/R lock nut 1/8" raccordo portagomma 1/8"
10 F.1.002.01 drain box pozzetto di scarico 11 L338/L100 plastic fastener 100x2,5 fascetta fermafilo 100x2,5 12 L339/1 vetrotex Ø6 sheath guaina vetrotex Ø6 13 B.1.001.X anti-suction steam valve complete kit kit antirisucchio per rubinetti vapore completo
Item Part Number/Codice Description Descrizione
Kit antirisucchio - Rubinetto vapore