2.50” (63.5 mm)

P/N Combination SAE

3625051

3631051

P/N Neoprene Diaphragm

N/A

N/A

P/N Welded Yoke (2.25”)

3625951

3631951

P/N Piggyback Plus Kit SAE

3625008

3631008

P/N Combination METRIC

3625049

3631049

Wt. Combination

18.6 lb (8.4 kg)

19.9 lb (9.0 kg)

Wt. Single

11.7 lb (5.3 kg)

11.5 lb (5.2 kg)

A

9.04” (229.6 mm)

9.04” (229.6 mm)

B

6.91” (175.5 mm)

6.66” (169.2 mm)

C

7.38” (187.5 mm)

8.31” (211.1 mm)

D

8.21” (208.5 mm)

8.21” (208.5 mm)

E

4.75” (120.7 mm)

F

5/8” - 11 UNC (M16 x 1.5 - 6g)

G

5/8” - 18 UNF (M16 x 1.5 - 6g)

Inlets

3/8” - 18 NPTF (M16 x 1.5 - 6H)

X - Min. (in the caged position)

8.00” (203.2 mm)

Welded Yoke Chamber

1.3”(33 mm)

Y

Y = 2.25”
For more welded yoke choices, see page 104.

Note: Product information and specifications subject to change without notice.

www.mgmbrakes.com

20

TR-THD
Standard Stroke Model
P/N Series
Model

3625

3631

TR2430LTHD

TR3030THD

1

Kit - NP Chamber (a)

9015152

9015149

2

Kit - Nuts & Bolts

9003001

9003001

3

Clamp Band Assembly

8216025

8216045

4

Diaphragm

8017141

8017730

5

Kit - Push-Rod Assembly (a) SAE

9064002

9064003

5a

Kit - Push-Rod Assembly (a) METRIC

9064016

9064035

6

Return Spring

8068002

8068002

7

Kit - Center Hole Shield

9065002

9065002

8

NP Chamber Assembly (a)

9015151

9015122

9

Kit - Nuts & Washers SAE

9002001

9002001

9a

Kit - Nuts & Washers METRIC

9002002

9002002
8130004

10

Hex Nut - Yoke SAE

8130004

10a

Hex Nut - Yoke METRIC

8130016

8130016

11

Kit - Weatherseal™ Plug

9019005

9019005

12

Kit - Release Bolt

9007003

9007003

13

Kit - Breather Tube

9081001

9081001

14

Piggyback Plus Kit SAE

3625008

3631008

OPTIONAL ITEMS - For additional replacement parts, refer to Section 12
Yoke Assembly

Refer to Replacement Parts Section 12

Boot & Retainer

Refer to Replacement Parts Section 12

Note: (a) To ensure correct stroke alert positioning, these kits must be used only on the designated MGM Brake units.
11
12

13

14

2
3
4

5/5a

6

1

7

Center Hole Diaphragm
(U.S. Patent #5,507,217)
Patented feature that aligns the piston,
diaphragm, power spring and internal push-rod
providing the following advantages: Maintains
component alignment; reduces power spring
stress; reduces coil clash; increases center-seal
life and eliminates the effects of severe vibration.
Corrosion Fighter Guide depicted in orange for
visual purposes only.

8
9/9a
10/10a

Note: Product information and specifications subject to change without notice.

21

www.mgmbrakes.com

DOUBLE DIAPHRAGM - STANDARD STROKE

Replacement Parts

TR-THDW
Standard Stroke Model

Combination

Piggyback Plus Kit
VMRS# 013-004-000

D

VMRS# 013-004-001

DOUBLE DIAPHRAGM - STANDARD STROKE

B

N/A

A

X

F
E
C

G

TR-THDW Model Features

• Tamper Resistant Design
• Center Hole Diaphragm
(U.S. Patent No. 5,507,217)
• Molded Nitrile Rubber Push-Rod Air Seal
• Center Hole Shield
• Externally Stored Release Bolt
• Epoxy-Coated Head, Non-Pressure
Chamber and Lower Push-Rod Assembly
• Epoxy Coated Return Spring
• 360 Aluminum Center Case
• Weatherseal™ Plug

• Heavy-Duty Steel Non-Pressure Chamber
(8-Gauge Standard on Type 3030 Aftermarket Models)
• Stroke Alert
• Polymer Push-Rod Guides
• Heavy-Duty Nylon Reinforced Diaphragms
• Heavy-Duty Nylon Reinforced Neoprene Diaphragms (Optional)
• External Breather Tube
• Heavy-Duty Power Spring 160 lb (72.6 kg) additional parking brake
force @ 1.25 inches (31.8 mm) of stroke
• Weld Reinforced Non-Pressure Housing with Welded Bolts
• Composite Guide - Corrision Fighter Technology (patent pending),
type 30 spring side models only

P/N Series

3444

Model

TR3030THDW

Size

3030

Stroke

2.50” (63.5 mm)

P/N Combination SAE

3444051

P/N Neoprene Diaphragm

N/A

P/N Welded Yoke (2.25”)

N/A

P/N Piggyback Plus Kit SAE

N/A

P/N Combination METRIC

3444049

Wt. Combination

19.9 lb (9.0 kg)

Wt. Single

N/A

A

9.04” (229.6 mm)

B

6.66” (169.2 mm)

C

8.31” (211.1 mm)

D

8.21” (208.5 mm)

E

4.75” (120.7 mm)

F

5/8” - 11 UNC (M16 x 1.5 - 6g)

G

5/8” - 18 UNF (M16 x 1.5 - 6g)

Inlets

3/8” - 18 NPTF (M16 x 1.5 - 6H)

X - Min. (in the caged position)

8.00” (203.2 mm)

Note: Product information and specifications subject to change without notice.

www.mgmbrakes.com

22

TR-THDW
Standard Stroke Model
Replacement Parts
P/N Series

3444

1

TR3030THDW

Kit - NP Chamber (a)

9015905

2

Kit - Nuts & Bolts

9003001

3

Clamp Band Assembly

8216045

4

Diaphragm

8017730

5

Kit - Push-Rod Assembly (a) SAE

9064003

5a

Kit - Push-Rod Assembly (a) METRIC

9064035

6

Return Spring

8068002

7

Kit - Center Hole Shield

9065002

8

NP Chamber Assembly (a)

9015259

9

Kit - Nuts & Washers SAE

9002001

9a

Kit - Nuts & Washers METRIC

9002002

10

Hex Nut - Yoke SAE

8130004

10a

Hex Nut - Yoke METRIC

8130016

11

Kit - Weatherseal™ Plug

9019005

12

Kit - Release Bolt

9007003

13

Kit - Breather Tube

9081001

OPTIONAL ITEMS - For additional replacement parts, refer to Section 12
Yoke Assembly

Refer to Replacement Parts Section 12

Boot & Retainer

Refer to Replacement Parts Section 12

Note: (a) To ensure correct stroke alert positioning, these kits must be used only on the designated MGM Brake units.

11
12

13

2
3
4

Weld Reinforced Non-Pressure Housing

5/5a

6

1

Heavy-gauge formed steel flat-bottom design, epoxy-coated for
total corrosion protection and “weld-reinforced” mounting studs
for added support in extreme vibration applications. (bolt actually
epoxy coated - depicted here lighter for visual purposes)
• 8-Gauge Standard on Type 3030 Aftermarket Model

7

8
9/9a
10/10a

Note: Product information and specifications subject to change without notice.

23

www.mgmbrakes.com

DOUBLE DIAPHRAGM - STANDARD STROKE