Marshall Engineering
A.B.N. 60 092 308 882
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Technical Information
39mm Round Axles - 750kg per Axle rating. Runs LM (Holden) bearings
40mm Square Axles - 1000kg per Axle rating. Runs LM (Holden) bearings
45mm Square Axles - 1400kg per Axle rating. Runs SL (Ford) bearings
50mm Square Axles - 2000kg per Axle rating. 2.0T bearing assembly
Axle sizing
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Axle length is measured from tip to tip of bare Axle
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Axle Length is determined by 2 variables-
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Frame width (chassis width to inside of wheels, not overall width. i.e. outside of mudguard to mudguard)
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Wheel offset (measured from the inside back of rim which bolts to hub, to the outside back of tyre)
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For wheels with standard offset (approx 120mm) such as HQ Holden & pre AU Ford, measure the frame width and add 17" (430mm) to determine correct axle length.
e.g. Frame width of 6' x 4' = 48" (1220mm) + 17" (430mm) = 65" Axle.
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For deeper offset wheels e.g. Commodore, Ford AU, 15" @ 145mm offset, the axle will need to be 19" (480mm) longer to allow for deeper offset of wheels.
e.g. Frame width of 6' x 4' = 48" (1220mm) + 19" (480mm) = 67" Axle.
When Axles are sized in this way the inside face of std profile tyre will be approx +/- 50mm away from the frame.
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Standard mudguards @ 9" wide will be suitable for tyres up to 195mm
LM (Holden bearings) suit 39mm Round & 40 mm Square Axles.
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Outer (small) bearings # LM 11910 - Cup
# LM 11949 - Cone
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Inner (large) bearings # LM 67010 - Cup
# LM 67048 - Cone
SL "slimline" (Ford bearings) suit 45mm Square Axles
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Outer (small) bearings # LM 68149 - Cup
# LM 68110 - Cone
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Inner (large) bearings # LM 12749 - Cup
# LM 12710 - Cone
Composite (Holden inner - Ford outer) bearings suit some 39mm Round & 40mm Square Axles.
Not a very popular combination to produce a marginally stronger stub axle- can cause a few headaches when bearing replacement is required!.
All trailers over 750kg GVM require brakes on at least one axle
All trailers over 2.0T to 4.5T require brakes on all axles and a breakaway system.
Hydraulic drum brakes run a 9" brake drum
Mechanical drum brakes run a 9" brake drum
Electric brakes run a 10" brake drum up to 1.4T per axle
Electric brakes run a 12" brake drum on 2.0T axles
Override brake systems (hydraulic or mechanical)
Advantages
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Brake system is independent of tow vehicle . i.e. no controller required
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lower cost
Disadvantages
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Brake system requires trailer to be applying continual load to tow vehicle (i.e. pushing) when braking for brakes to operate
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maximum load 2000kg gross (trailer and load)
Electric brakes
Advantages
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More efficient (larger) brakes
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Amount of braking can be manipulated though brake controller as required (i.e. heavier loads require more braking power to be applied)
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Lower cost option for braking systems over 2000kg gross
Disadvantages
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Trailer cannot be used with vehicles not fitted with brake controller (not always a disadvantage!)
(for all hubs/hubdrums/hubdiscs)
Holden HT - 7/16" UNF studs 5 stud - PCD 65mm from stud to stud
Holden HQ - 7/16" UNF studs 5 stud - PCD 72mm from stud to stud
Holden Commodore - 7/16" studs 5 stud - PCD
Ford - 1\2" UNF studs 5 stud - PCD 68mm from stud to stud
Landcruiser - 1/2" UNF studs 6 stud - PCD
Landcruiser 100 series - 9/16" UNF studs 5 stud - PCD