Tuff stuff MSL-IV Installation guide

America’s Premium Exercise Equipment
ASSEMBLY INSTRUCTION MANUAL
MSL-IV
Muscle IV Home Gym
L 8’-0” W 4’-0” H 7’-0”
Revision Date 9 -9 8

MSL-IV Muscle IV Home Gym
1
A
bout the Muscle IV Home Gym (MSL-IV).
Congratulations on your new purchase of the Muscle IV
H
ome Gym (MSL-IV). This gym is capable of a variety of
d
ifferent exercises, as well as, smooth and user-friendly
a
djustment features. In addition, this gym has been
d
esigned to meet the needs and performance requirements
o
r a suitable home exercise machine. We hope you are
c
ompletely satisfied with this product and wish you many
y
ears of enjoyment.
T
uff Stuff Equipment
Every Tuffstuff product has been built to precise quality
tandards and has been carefully packaged to ensure that
d
amage will not occur during shipment. The limited lifetime
w
arranty and signature indicating final inspection which was
c
onducted by our line foreman, is an expression of our
c
onfidence in the completeness, the materials, and
w
orkmanship of this product.
W
arranty
SEE WARRANTY REGISTRATION CARD
R
egistration Card
To avoid unnecessary delays in warranty parts and to
n
sure that a permanent record of your purchase is on file
w
ith our factory, be sure to complete the warranty
e
gistration card and send it to Task Industries today.
S
afety Information
)Familiarize yourself and others with the proper operation
a
nd workout recommendations for each piece of Tuff Stuff
e
quipment prior to use.
2
)Consult with your physician before beginning any
e
xercise program.
3
)Use proper discretion when children are present.
4
)Frayed or worn cables can be dangerous and may cause
n
jury. Periodically check these cables for any indication of
w
ear.
5
)Inspect machine for any sign of parts or hardware
b
ecoming loose.
6
)Keep hands and limbs clear from weight stack and all
o
ther moving parts.
Maintenance Information
1) Lubrication of all moving parts is essential to the longevit
y
and optimal performance of your Muscle IV Home Gym.
Initial lubrication of some parts of your gym have been done
at the factory, but the weight stack guide rods must be
lubricated at the time of assembly. We recommend a clear
aerosol, silicone or Teflon spray.
Note:Do not use oil based lubricants as they will attract
dust,dirt, and grime and will eventually gum up and erode
bushings and sealed bearings.
2) All pulleys and bushings should be checked regularly for
signs of wear.
3) Check and adjust tension on cables periodically as it will
maintain proper anatomical function.
4) Periodically check all moving parts, upholstery and grips
for wear. If replacement is necessary, please contact your
local Tuff Stuff retailer or call our Customer Service
Department.
5) As needed, upholstery may be cleaned with a mild
solution of soap and water. Regular use of a vinyl treatment
will add to the life and appearance of your upholstery.
6) All chrome plated surfaces should be cleaned regularly to
prolong the life and luster of the finish. Wipe machine down
with a damp cloth and dry thoroughly each day. At least
once a week your chrome equipment should be polished
with a commercial grade or automotive type chrome polish.
Tool Requirements
1) Two 3/4” Open-end wrenches
2) Two 9/16” Open-end wrenches
3) One rubber mallet
4) Needle nose pliers
5) One can Silicone Spray/ Teflon Spray Lubricant
6) Snap ring pliers
7) Hex Key 3/16” (Supplied)
7) Windex or household glass cleaner
Hardware Measurement Diagram
I
n
t
ro
d
uc
ti
on

F
IG. 1 On a flat surface, lay the Base Frame (#2) down
a
nd insert two Plastic Insert Caps 2” Sq. (#64). Next, insert two
P
lastic Insert Caps 2” Sq. w/groove (#63) onto the front
s
tabilizer of the Base Fr ame (#2),as shown above.
FIG. 2 Locate the Low Row Foot Support (#37) and slid
e
a Hard Grip .875 X 8 (#60) over each end of the tube, as
illustrated above. The hard Grip .875 X 8 (#60) fits very tightl
y
onto the Low Row Foot Support (#37) and it may be
necessary to use windex or a household glass cleaner (as
shown) to complete this procedure. Next, insert one Plasti
c
Insert Cap 2” Sq. (#64) into the tube-end of the Low Row Foo
t
Support (#37).
F
IG. 3 Install the Low Row Swivel Pulley Bracket (#25)
nto the receptacle on the Low Row Foot Support (#37) and
s
ecure it using one Nylon Insert Jam Lock Nut 1/2-13 (#88)
a
nd one Flat Washer SAE 1/2 (#89). Note:It is recommended
t
hat the axle on the Low Row Swivel Pulley Bracket (#25)be
l
ubricated with grease prior to this assembly.
FIG. 4 Attach the Low Row Foot Support (#37) to the
Base Frame (#2) and secure it using using two Hex Head Cap
Screws 3/8-16 X 2 3/4 (#77), four Flat Washers SAE 3/8 (#90)
and two Nylon Insert Jam Lock Nuts 3/8-16 (#86). Next, insert
two Plastic Insert Caps 2 X 3 (#101) into the pulley bracket
housing on the Low Row Foot Support (#37).
Owners’ Manual: Assembly Instruction
s
IMPROVED
See #63 on page 19
M
SL-IV Muscle IV Home Gym 2

F
IG. 5 Attach the Rear Upright (#4) to the Base Frame (#2)
a
nd secure it using two Hex Head Cap Screws 3/8-16 X 2 3/4
(
#77), four Flat Washers SAE 3/8 (#90) and two Nylon Insert
L
ock Nuts 3/8-16 (#86). Note:Do not tighten this hardware
a
ssembly at this time.Next, insert two Plastic End Caps 2” Sq.
w
/groove (#63) into the Rear Upright (#4),as shown above.
FIG. 6 Attach the Front Upright (#3) to the Base Frame
(#2) and secure it using one Hex Head Cap Screw 3/8-16 X 2
3/4 (#77), two Flat Washers SAE 3/8 (#90) and one Nylon
Insert Jam Lock Nut 3/8-16 (#86). Note:Do not tighten this
hardware assembly at this time.
F
IG. 7 Attach the Leg Extension Seat Frame (#38) to the
B
ase Frame (#2).Secure the Leg Extension Seat Frame
(
#38) to the Base Frame (#2) using one Hex Head Cap Screw
3
/8-16 X 4 1/2 (#93), two Flat Washers SAE 3/8 (#90) and one
N
ylon Insert Jam Lock Nut 3/8-16 (#86). Next, secure the Leg
E
xtension Seat Frame (#38) to the Front Upright (#3) using
o
ne Hex Head Cap Screw 3/8-16 X 2 3/4 (#77), two Flat
W
ashers SAE (#90) and one Nylon Insert Jam Lock Nut 3/8-16
(
#86). Note:Do not tighten this hardware assembly at this
t
ime.
FIG. 8 Slide the Pec Dec Adj Seat Tube (#27) onto th
e
Rear Upright (#4),as shown above. Note:Position the Pe
Dec Adj Seat Tube (#27) with the Push-Pull Pin 1/2 (#56
)
facing the same side as the selector holes on the Rear Uprig
h
(#4).
MSL-IV Muscle IV Home Gym
3

F
IG. 9 Secure the Top Pulley Assembly (#5) to the Front
U
pright (#3) using two Hex Head Cap Screws 3/8-16 X 4 1/4
(
#99) four Flat Washers SAE 3/8 (#90) and two Nylon Insert
L
ock Nuts 3/8-16 (#86). Next, secure the Top Pulley
A
ssembly (#5) onto the Rear Upright (#4) using one Hex
H
ead Cap Screw 3/8-16 X 3 (#94), two Flat Washers SAE 3/8
(
#90) and one Nylon Insert Jam Lock Nut 3/8-16 (#86). Note:
T
his bolt should be placed in the top hole of the Rear Upright
(
#4).
FIG. 10 Next, attach the Pec Dec Housing (#18) to the
Rear Upright (#4).secure this assembly using one Hex Head
Cap Screw 3/8-16 X 3 1/2 (#8), two Flat Washers SAE 3/8
(#90) and one Nylon Insert Jam Lock Nut 3/8-16 (#86). Note
:
This bolt should be placed in the top hole of the Pec Dec
Housing (#18).Next, install one Hex Head Cap Screw 3/8-1
6
X 3 (#94), two Flat Washers SAE 3/8 (#90) and one Nylon
Insert Jam Lock Nut 3/8-16 (#86) through the lower hole of th
e
Pec Dec Housing (#18).Finally, install the Rubber Stoppe
r
(#62) and two Plastic Insert Caps 2 Sq. (#64), as shown
above.
F
IG. 11 Attach the Pec Dec Arm (#7) to the Pec Dec Arm/
C
am Support (#13) and secure it using one Hex Head Cap
S
crew 1/2-13 X 3 (#98), two Flat Washers SAE 1/2 (#89) and
o
ne Nylon Insert Jam Lock Nut 1/2-13 (#88). Repeat this
p
rocedure for the opposite Pec Dec Arm Assembly. Note:It is
r
ecommended that the axle on the Pec Dec Arm (#7) be
l
ubricated with grease prior to assembly.
FIG. 12 Mount the assembled Pec Dec Arms (#7) in
Fig.11 to the Pec Dec Housing (#18) axles, as illustrated.
Note:It is recommended that the Pec Dec Housing (#18)
axles be lubricated with grease prior to assembly.Next, mount
the two Pec Dec Cams (#9) onto the the axles of the Pec Dec
Housing (#18),as shown above.
Owners’ Manual: Assembly Instructions
M
SL-IV Muscle IV Home Gym 4

F
IG. 13 Secure the two Pec Dec Cams (#9) to the Pec
D
ec Housing (#18) using two Retaining Snap Rings (#49).If
p
ossible, use special snap ring pliers for this job, as shown
a
bove. If not available, carefully work each Retaining Snap
R
ing (#49) into the groove, then push down alternately with a
s
crew driver working the Retaining Snap Ring (#49) into the
g
roove. Note:Be careful not to distort the Retaining Snap
R
ing (#49) or bend it.
FIG. 14 Insert a Handle Bracket Left (#11) and Right
(#97) into the two Pec Dec Arms (#7) and secure them using
two Hex Head Cap Screws 3/8-16 X 1 (#81) and two Fender
Washers 3/8- 1 1/2 (#106).
F
IG. 15 Insert the two Pec Dec Swivel Pulley Brackets
(
#25) into the receptacles on the Top Pulley Assembly (#5)
a
nd secure using four Flat Washers SAE 1/2 (#89) and two
N
ylon Insert Lock Nuts 1/2-13 (#88). Do not over-tighten these
n
uts, as the Pec Dec Swivel Pulley Brackets (#25) must
m
ove freely during use of the machine. Note:It is
r
ecommended that the Pec Dec Swivel Pulley Brackets (#25)
b
e greased prior to assembly.
FIG. 16 Install the Ab Crunch Insert Bracket (#57) and
one Nylon Pulley 4 1/2 Rd. (#35-Not shown See Fig 56) into
the Rear Upright (#4) and secure it using one Hex Head Ca
p
Screw 3/8-16 X 2 1/2 (#78), two Flat Washers SAE 3/8 (#90)
and one Nylon Insert Jam Lock Nut 3/8-16 (#86).
MSL-IV Muscle IV Home Gym
5

F
IG. 17 Insert the two Guide Rods (#20) into the
r
eceptacle of the Base Frame (#2),as shown above. Next,
nsert two Rubber Donuts 1 X 2 1/2 (#41) onto each each
G
uide Rod (#20).Note:Lubricate the Guide Rods (#20) with
s
ilicone or teflon lubricant at this time.
FIG. 18 Carefully begin sliding the 10 Lb. Weight Plates
(#52) over the Guide Rods (#20),one or two at a time as our
skill permits. Make sure that the 10 Lb. Weight Plates (#52)
are installed onto the Guide Rods (#20) in numerical order,
beginning with the number 200 at the bottom,190 next, and s
o
on.
F
IG. 19 Now slide the Top Plate/Selector Bar (#58) over
t
he Guide Rods (#20) allowing it to come to rest on the
c
ompleted weight stack.
FIG. 20 Maneuver each of the Guide Rods (#20) into the
holes on the bottom side of the Guide Rod Retainer (#54).
Next, mount the Guide Rod Retainer (#54) along with the two
captive Guide Rods (#20) to the side of the Top Pulley
Assembly (#5).Secure this assembly using two Hex Head
Cap Screws 3/8-16 X 3 (#94), four Flat Washers SAE 3/8
(#90) and two Nylon Insert Jam Lock Nuts 3/8-16 (#86).
Owners’ Manual: Assembly Instruction
s
M
SL-IV Muscle IV Home Gym 6

F
IG. 21 Locate the Adjustable Pulley Bracket (#26) and
t
hread a Hex Nut 1/2-13 (#88) and a Flat Washer SAE 1/2
(
#89) onto it. Use the illustration above for further clarification
o
f this bolt and nut assembly. Next, insert the Adjustable
P
ulley Bracket (#26) into the Guide Rod Retainer (#54) and
s
ecure it using one Nylon Insert Jam Lock Nut 1/2-13 (#88)
a
nd one Flat Washer SAE 1/2 (#89). Note:Loosely secure the
n
ut to allow adjustment for cable tension later in the assembly
p
rocess.
FIG. 22 Insert the Lat Bar Holder (#22) into the tube-end o
f
the Top Pulley Assembly (#5),as shown above. Secure this
assembly using one Hex Head Cap Screw 3/8-16 X 2 1/2
(#78), two Flat Washers SAE 3/8 (#90) and one Nylon Insert
Jam Lock Nut 3/8-16 (#86).
F
IG. 23 Now position the Press Arm (#1) to the Top Pulley
A
ssembly (#5),as shown above. Next, press the Pivot Axle 1
X
11 3/4 (#19) through the holes in the Press Arm (#1) using
a
rubber mallet hammer until it is flush with both sides. Note:It
i
s recommened that the Pivot Axle 1 X 11 3/4 (#19) be
g
reased prior to this assembly.
FIG. 24 At the top of each end of the Press Arm (#1) is a
set screw fixture. Secure the Press Arm (#1) using two Set
Screws 3/8-16 X 1/2 (#61). Use the Hex Key 3/16 (#50) tool fo
r
securing the Set Screws 3/8-16 X 1/2 (#61). Next, insert two
Plastic Insert Caps 1 X 2 (#67) into the tube-ends of the Press
Arm (#1).
MSL-IV Muscle IV Home Gym
7

F
IG. 25 Locate the Range Of Motion Device (#48),the
L
arge Cable Retainer (#107) and two Nylon Pulleys 4 1/2 Rd.
(
#35). Assemble as shown using one Hex Head Cap Screw
3
/8-16 X 3 (#94), three Nylon Spacers 3/8 X 3/8 (#72), two Flat
W
ashers SAE 3/8 (#90) and one Nylon Insert Jam Lock Nut
3
/81-6 (#86). Refer to Fig. C on page 18 for further clarification
o
f this assembly.
FIG. 26
Next, locate the Black Caster 2 X 1 (#34) and two
Nylon Spacers (#72). Assemble to the Range Of Motion
Device (#48) using one Hex Head Cap Screw 3/8-16 X 2 3/
4
(#77), two Flat Washers SAE 3/8 (#90) and one Nylon Inser
t
Jam Lock Nut 3/8-16 (#86). Refer to Fig. Con page 18 fo
r
further clarification of this assembly.
F
IG. 27 Locate the Range Of Motion Tube (#47) and one
S
houlder Bolt 3/8 X 3/8 (#95). Insert the Range Of Motion
T
ube (#47) into the Range Of Motion Device (#48),as shown
a
bove. Secure this assembly using the Hex Key 3/16 (#50).
FIG. 28 Attach the Range Of Motion Tube (#47) onto th
e
Press Bar (#1) and secure it using two Hex Head Cap Screws
3/8-16 X 3 1/4 (#76), four Flat Washers SAE 3/8 (#90) and tw
o
Nylon Insert Jam Lock Nuts 3/8-16 (#87).
Owners’ Manual: Assembly Instruction
s
M
SL-IV Muscle IV Home Gym 8

F
IG. 29 Attach the Foot Roll Bracket (#46) to the Leg
E
xtension Arm (#42) and secure it using one Hex Head Cap
S
crew 1/2-13 X 2 3/4 (#92), two Flat Washers SAE 1/2 (#89)
a
nd one Nylon Insert Jam Lock Nut 1/2-13 (#88). Next, install a
R
ubber Bumper 3/8 X 1 1/2 (#33) to the Leg Extension Arm
(
#42),as shown above, and secure it using one Hex Head Cap
S
crew 3/8-16 X 1 (#81) and one Flat Washer SAE 3/8 (#90).
FIG. 30 Attach the Leg Extension Arm (#42) to the Leg
Extension Seat Frame (#38),as shown above, and secure it
using one Hex Head Cap Screw 1/2-13 X 3 1/4 (#96), two Fla
t
Washers SAE 1/2 (#89) and one Nylon Insert Jam Lock Nut
1/2-13 (#88). Note:Be sure not to over-tighten this hardware
assembly as the Leg Extension Arm (#42) should be allowe
d
to swivel freely. Also, it is recommended that the Le
g
Extension Arm (#42) be greased at the pivot point prior to
assembly.
F
IG. 31 Insert the Foot Roll Tube 1 X 16 (#100) through
t
he Foot Roll Bracket (#46).Then slide a Foam Foot Roll 7
X
4 X 1 (#32) onto each end of the Foot Roll Tube 1 X 16
(
#100).Next, insert a Plastic Insert Cap 1” Rd. (#65) into each
e
nd of the Foot Roll Tube 1 X 16 (#100).
FIG. 32 Attach the Seat Pad (Bench Press) (#45) to th
e
Bench Press Adj Seat Tube (#39) and secure it using two
Hex Head Cap Screws 3/8-16 X 1 3/4 (#79) and two Flat
Washers SAE 3/8 (#90), as shown above.
MSL-IV Muscle IV Home Gym
9

F
IG. 33 Insert the Bench Press Adj Seat Tube (#39) into
t
he receptacle on the Leg Extension Bench Frame (#38),as
s
hown above. Next, insert two Foam Foot Rolls 7 X 4 X 1
(
#32) and two Plastic Insert Caps 1” Rd. (#65) onto the tube-
e
nds of the Foot Roll Tube 1 X 16 (#100).Note:Pull the
P
ush-pull pin 1/2 (#56) to allow the Bench Press Adj Seat
T
ube (#39) to adjust up and down.
FIG. 34 On the Bench Press Adj Seat Tube (#39) there i
s
a threaded socket. Secure the Foot Roll Tube 1 X 16 (#100)
using one Set Screw 1/4-20 X 1/4 (#105). Use the supplied
Hex Key 1/8 (#69) tool for securing this Set Screw (#114).
F
IG. 35 Mount the Back Pad Adj Bracket (#10) to the
B
ench Press Back Pad (#44) and secure using two Hex Head
C
ap Screws 3/8-16 X 1 (#81), two Bumper Washers 3/8 (#108)
a
nd two Bumper Caps Black (#91). Refer to the Exploded View
o
n page 19 for further clarification of this assembly.
FIG. 36 Secure the Back Pad Bracket (#10) to the Front
Upright (#3) using one Hex Head Cap Screw 3/8-16 X 3 1/
4
(#76), four Flat Washers Nylon 3/8 (#6), two Flat Washers
SAE 3/8 (#90) and one Nylon Insert Jam Lock Nut 3/8-1
6
(#86). Refer to the Exploded View on page 19 for further
clarification of this assembly.
M
SL-IV Muscle IV Home Gym 10

F
IG. 37 Next, slide the Foot Roll Tube 1 X 23 3/4 (#55)
t
hrough the receptacles on the Back Pad Adj Bracket (#10),
a
s shown above. Next, install the Foam Foot Rolls 7 X 4 X 1
(
#32) as described in Fig. 31 on page 9.
FIG. 38 Attach the Pec Dec Seat Pad (#24) to the Pec De
c
Seat Adj Tube (#27) and secure it using two Hex Head Cap
Screws 3/8-16 X 2 3/4 (#77) and two Flat Washers SAE 3/8
(#90).
FIG. 39 Attach the Pec Dec Back Pad (#43) to
the Rear Upright (#4) and secure it using two Hex
Head Cap Screws 3/8-16 X 2 3/4 (#77) and two
Flat Washers SAE 3/8 (#90).
FIG. 40 Route the Lat Cable (#14) through the Top Pulle
y
Assembly (#5).Then insert one Nylon Pulley 4 1/2 Rd. (#35)
and secure it using one Hex Head Screw 3/8-16 X 2 1/2 (#78),
two Flat Washers SAE 3/8 (#90) and one Nylon Insert Jam
Lock Nut 3/8-16 (#86). Refer to Fig. 1 on page 17 for further
detailed illustration of this cable routing.
MSL-IV Muscle IV Home Gym
11

F
IG. 41 Insert the Lat Cable (#14) and one Nylon Pulley 4
1
/2 Rd (#35) into the Top Pulley Assembly (#5) and secure it
u
sing one Hex Head Cap Screw 3/8-16 X 2 1/2 (#78), two Flat
W
ashers SAE 3/8 (#90) and one Nylon Insert Jam Lock Nut
3
/8-16 (#86). Refer to Fig. 1 on page 17 and Fig. B on page
1
8 for further detailed illustration of this cable routing.
FIG. 42 Route the Lat Cable (#14) over, then under the
Nylon Pulley 4 1/2 Rd. (#35), as illustrated above. Refer to Fig.
1on page 17 and Fig. B on page 18 for further detailed
illustration of this cable routing.
F
IG. 43 Next, attach a Nylon Pulley 4 1/2 Rd. (#35) to the
p
ulley bracket on the Front Upright (#3) and secure it using
o
ne Hex Head Cap Screw 3/8-16 X 1 3/4 (#79), two Flat
W
ashers SAE 3/8 (#90), one Nylon Insert Jam Lock Nut 3/8-16
(
#86) and one Cable Retainer Bracket (#111).Next, route the
L
at Cable (#14) under, then over the Nylon Pulley 4 1/2 Rd.
(
#35), as shown above. Refer to Fig. 1 on page 17 and Fig. B
o
n page 18 for further detailed illustration of this cable routing.
FIG. 44 Continue to route the Lat Cable (#14) over the
Nylon Pulley 4 1/2 Rd. (#35), then under, as shown above.
Refer to Fig. 1 on page 17 and Fig. B on page 18 for further
detailed illustration of this cable routing.
Owners’ Manual: Assembly Instruction
s
M
SL-IV Muscle IV Home Gym 12

F
IG. 45 Attach a Nylon Pulley 4 1/2 Rd. (#35) to the
F
ront Upright (#3) and secure it using one Hex Head Cap
S
crew 3/8-16 X 3 3/4 (#75), two Flat Washers SAE 3/8 (#90),
o
ne Nylon Insert Jam Lock Nut 3/8-16 (#86) and one Cable
R
etainer Bracket (#111).Then continue to route the Lat
C
able (#14) over the pulley as shown. Refer to Fig. 1 on page
1
7 and Fig. B on page 18 for further detailed illustration of this
c
able routing.
FIG. 46 Assemble the Double Pulley Plates 1/8 X 2 X
9
(#21) using two Nylon Pulleys 4 1/2 Rd. (#35), two Hex Head
Cap Screw 3/8-16 X 1 3/4 (#79), four Flat Washers SAE 3/8
(#90) and two Nylon Insert Jam Lock Nuts 3/8-16 (#86). Refer
to Fig. 1 on page 17 for further detailed illustration of this
cable routing. Next, route the Lat Cable (#14) through the
Double Pulley Plates 1/8 X 2 X 9 (#21),as shown above.
Note:The four holes on the Double Pulley Plates 1/8 X 2 X
9
(#21) are used to adjust the cable tension once the cable
routing has been completed.
F
IG. 47 Insert a Nylon Pulley 4 1/2 Rd. (#35) into the
A
djustable Pulley Bracket (#26) and secure it using one Hex
H
ead Cap Screw 3/8-16 X 1 3/4 (#79), two Flat Washers SAE
3
/8 (#90) and one Nylon Insert Jam Lock Nut 3/8-16 (#86).
R
oute the Lat Cable (#14) through the Adjustable Pulley
B
racket (#26),as shown above.
FIG. 48 Attach the Lat Cable (#14) to the Top Plate /Selecto
Bar (#58) and secure it using one Split Bolt 1/2-13 X 1 (#51) a
n
one Split Washer 1/2 (#82). Refer to Fig. E on page 18 for
further detailed illustration of this assembly. Note:Be sure this
hardware assembly is securely fastened.
MSL-IV Muscle IV Home Gym
13

F
IG. 49 Begin routing the Pec Dec Cable (#16).Attach one
e
nd of the Pec Dec Cable (#16) to the Pec Dec Cam (#9) and
s
ecure it using one Socket Head Cap Screw 1/4 X 3/4 (#102)
a
nd one Nylon Insert Jam Lock Nut 1/4-20 (#103). Refer to
F
ig. A on page 18 for further detailed illustration of this
a
ssembly.
FIG. 50 Attach one Nylon Pulley 4 1/2 Rd. (#35) to each o
f
the Swivel Pulley Brackets (#25) and secure them using tw
o
Hex Head Cap Screws 3/8-16 X 1 3/4 (#79), four Flat Washer
s
SAE 3/8 (#90) and two Nylon Insert Jam Lock Nuts 3/8-1
6
(#86). Route the Pec Dec Cable (#16) over the Nylon Pulle
y
4 1/2 Rd. (#35), as shown above. Refer to Fig. Aon page 1
8
for further detailed illustration of this cable routing.
F
IG. 51 Insert two Nylon Pulleys 4 1/2 Rd. (#35) into the
O
ffset Pulley Bracket (#23) and secure them using two Hex
H
ead Cap Screws 3/8-16 X 1 3/4 (#79), four Flat Washers SAE
3
/8 (#90) and two Nylon Insert Jam Lock Nuts 3/8-16 (#86).
N
ext, route the Pec Dec Cable (#16) through this bracket, as
s
hown above. Repeat the same procedure in Fig. 49 and Fig.
5
0to complete the routing of the Pec Dec Cable (#16).Refer to
F
ig. A on page 18 for further detailed illustration of this cable
r
outing.
FIG. 52 Attach the Leg Extension Cable (#15) to the Leg
Extension Arm (#42) and secure it using one Hex Head Cap
Screw 3/8-16 X 1 (#81) and one Nylon Insert Jam Lock Nut
3/8-16 (#86). Refer to Fig. F on page 18 for further detailed
illustration of this cable routing.
Owners’ Manual: Assembly Instruction
s
M
SL-IV Muscle IV Home Gym 14

F
IG. 53 Insert a Nylon Pulley 4 1/2 Rd. (#35) into the pulley
b
racket on the Base Frame (#2) and secure it using one Hex
H
ead Cap Screw 3/8-16 X 1 3/4 (#79), two Flat Washers SAE
3
/8 (#90) and one Nylon Insert Jam Lock Nut 3/8-16 (#86).
N
ext, insert the Leg Extension Cable (#15) through the Front
U
pright (#3) then through the Nylon Pulley 4 1/2 Rd. (#35), as
s
hown above. Refer to Fig. I on page 17 for further detailed
llustration of this cable routing.
FIG. 54 Next, lift the loose end of the Leg Extension Cabl
e
(#15) up into the Double Pulley Plates 1/8 X 2 X 9 (#21),as
shown above. Refer to Fig. I on page 17 for further detailed
illustration of this cable routing.
F
IG. 55 Insert a Nylon Pulley 4 1/2 Rd. (#35) into the
p
ulley bracket on the Base Frame (#2) and secure it using one
H
ex Head Cap Screw 3/8-16 X 1 3/4 (#79), two Flat Washers
S
AE 3/8 (#90) and one Nylon Insert Jam Lock Nut 3/8-16
(
#86). Next, route the Leg Extension Cable (#15) through the
N
ylon Pulley 4 1/2 Rd. (#35), as shown above.
FIG. 56 Now, lift the loose end of the Leg Extension Cabl
e
(#15) and route it through the Offset Pulley Bracket (#23),a
s
shown above.
MSL-IV Muscle IV Home Gym
15

F
IG. 57 Next, route the Leg Extension Cable (#15) through
t
he Offset Pulley Bracket (#23),as shown above. Refer to
F
ig. I on page 17 for further detailed illustration of this cable
r
outing.
FIG. 58 Finally, route the remainder of the Leg Extension
Cable (#15) through the Nylon Pulley 4 1/2 Rd. (#35) located
on the Rear Upright (#4).Then, assemble the Strap Bracket
(#83) and the Abdominal Strap (#53) onto the cable-end of th
e
Leg Extension Cable (#15).Secure this assembly using one
Shoulder Bolt 3/8 X 3/4 (#80), one Nylon Ball 1 3/4 X 5/16
(#85) and one Nylon Insert Lock Nut 5/16-18 (#84). Refer to
Fig. D on page 18 for further detailed illustration of this
assembly.
F
IG. 59 Insert the end of the Low Row Cable (#17) into the
L
ow Row Swivel Pulley Bracket (#40) and secure it into
p
lace using one Nylon Pulley 4 1/2 Rd. (#35). Use the pulley
m
ounting hardware described in Fig. 55 on page 15 to fasten
t
he pulley and cable into place.
FIG. 60 Insert a Nylon Pulley 4 1/2 Rd. (#35) and the Lo
w
Row Cable (#17),as shown above. Use the pulley mounting
hardware described in Fig. 55 on page 15 to fasten the pulley
into place.
Owners’ Manual: Assembly Instructions
M
SL-IV Muscle IV Home Gym 16

F
IG. 61 Finally, coonect the end of the Low Row Cable
(
#17) to the empty pulley bracket located on the Base Frame
(
#2) and secure it using one Hex Head Cap Screw 3/8-16 X 1
3
/4 (#79), two Flat Washers SAE 3/8 (#90), two Nylon
S
pacers 3/8 X 3/8 (#72) and one Nylon Insert Jam Lock Nut
3
/8-16 (#86). Refer to Fig. Gon page 18 for further detailed
llustration of this assembly.
FIG. 62 This completes the assembly of the MSL-IV. It is
recommended that you check and secure all the hardware
assemblies and inspect all cable routing for proper tension and
assembly.
See Fig. B
Fig. I
Note:Some Parts
Not Shown or cut
away for clarity
See Figure A
See Figure B
See Figure D
See Figure D
See Figure E
See Figure F
See Figure G, H
See Figure G, H
See Figure C
MSL-IV Muscle IV Home Gym
17

Owners’ Manual: Assembly Instructions
Note:Some Parts Have Been Cut
Away For Clarity.
FIG. BFIG. A
FIG. C FIG. D FIG. E
FIG. HFIG. GFIG. F
Leg Press Configuration
M
SL-IV Muscle IV Home Gym 18

MSL-IV Muscle IV Home Gym
19