84
UNDERCARRIAGE MANAGEMENT
Management & Merchandising
Summary of Pin/Bushing to Link Ratios
Pin/Bushing Critical Actions to be Taken
Item to Link % Sealed & Lubricated
Worn Ratios Sealed Link Assembly Link Assembly
Less than 1:1 ratio Treat like 1:1 (Sealed & Treat like 1:1 ratio - will
Lubricated Track may not provide bushing safety factor.
improve performance).
Approx. 1:1 Turn P + B only if link rebuilt Turn only if link welded.
— expect greater ratio after Perform when bushing or link/
turn. roller combined reaches 100.
Expect same life after turn
to link destruction point.
Approx. 1.5:1 Treat like 2:1 since shorter a) Treat like 2:1 and wet turn
P + B life after turn. at bushing service point. This
will give bushing life safety
factor.
b) Dry turn at bushing service
point if no link weld to be done
and if records show sufficient
life of dry turn.
Approx. 2:1 Turn at service point. Wet turn only — at bushing
service point.
Between 2:1 & 3:1 Turn at C.I. service point 1. Check track tension.
and replace P & B at 2. Check rear roller condition.
second side service point. 3. Check shoe width.
4. Check your measurements.
5. Turn at bushing service point.
Approx. 4:1 1. Turn, replace & turn at See Above.
service points of critical item.
2. Replace with Sealed and
Lubricated Track.
Above 4:1 1. Keep turning & replacing See Above.
P & B until link rail/roller
combination utilized as long
as P & B retention justifies.
2. Replace with Sealed &
Lubricated Track.