tizdaz

hi guys im rebuilding my servo and noticed the motor has a white kind of paste around tue casing, anyone know what type of paste this is please, I think its the same paste used on pc motherboard heatsinks/cpu etc its like a thermal paste but not sure?

BarracudaHockey

My Feedback: (11)

Its grease. Servo city sells it

www.servocity.com product #58450

fizzwater2

My Feedback: (61)

why would you put grease around the motor? Gears yes, but motor?

tizdaz

I dont think its grease, its a white paste of some kind, my servo is a rhino digi4

fizzwater2

My Feedback: (61)

I"m not familiar with any of the rhino servos, probably won't be able to help.

Is the case of the servo metal? If so, the white material may be heatsink compound, intended to help transfer heat from the motor to the case so it can be dissipated.

tizdaz

I thiny ya right, yup case is metal

BarracudaHockey

My Feedback: (11)

Sorry it was early and I read "servo and white paste" and came up with grease.

Yea, thats thermal epoxy.

tizdaz

cheers guys ordered some off ebay :-)

houckj

Is this it:

A.T.

Servo - DIY Repair - Lubrication / Servo Grease

. Servo - DIY Repair - Lubrication (servo grease)
quote:

"Caution, most greases liquify on warming as within operating servos and melt into "the works" killing the servo.
recommend use:
1. Hitec Universal Servo Grease (Silicon base) lubricant, sold by Hitec RCD as part number # 58450
2. Silicone dielectric grease. Silicon dielectric grease does not dry over time, temperature and does not attack plastics. A small dab is sufficient. Available at most Auto Electrical stores or local dive shops where it is sold as "O" ring lubricant. (The small pot lasts a very long time)
3. Never use lithium based grease as it will thicken up and, with the added load of the thickening grease, cause the servo to prematurely burn out.

Wikipedia "Grease (lubricant)"
"Wiki" link =
"As an Electrical Insulator
Dielectric grease is a nonconductive grease. Because it is nonconductive it does not enhance the flow of electrical current. Electrical conductors should not be coated with dielectric grease prior to being mated. However, dielectric grease is often applied to electrical connectors, particularly ones which contain rubber gaskets, as a way to provide a nonconductive lubricant and sealer for the rubber portions of the connector. The widest use of dielectric grease is in high-voltage connections associated with spark plugs. The grease is applied to the rubber boot of the plug wire. This helps the rubber boot slide onto the ceramic insulator of the plug. The grease also acts to seal the rubber boot, while at the same time preventing the rubber from becoming stuck to the ceramic. Generally spark plugs are in located in areas of high temperature, and the grease is formulated to withstand the temperature range expected.
Another common use of dielectric grease is on the rubber mating surfaces or gaskets of multi-pin electrical connectors used in automotive and marine engines. The grease again acts as a lubricant and a sealant on the nonconductive mating surfaces of the connector. It is not recommended to be applied to the actual electrical conductive contacts of the connector because it could interfere with the electrical signals passing through the connector."

. Digital Servo - Why They Burnout
. Servo - Installation and Tips for longer life with pictures.
. Servo - DIY Repair - Thermal Paste for Digital Servo Heatsink

Alan T.
Alan's Hobby, Model & RC FAQ Web Links

26Feb12 added:
Hitec FAQ -Troubleshooting Your Servo Problems
Q. What is servo grease?
A. Use only silicon based servo grease when replacing servo gears.
Using other type of grease not intended for servo gears may produce a gas
when used in sealed cases which may coat a nasty film on the motor brush
that could stop the servos operation.
Hitec recommends our product #58450, servo grease."

airbusdrvr

I never cease to be amazed at the info Alan has. Good informative answers.

Truckracer

My Feedback: (19)

Informative, yes, but the response didn't really address the OP's question. The OP seemed to be referring to the typical white thermal heat sink compound commonly used in electronic equipment.

A.T.

Perhaps the OP could confirm exactly which servo and hopefully provide a photo - as post reads the substance
is spread around the inside of servo case = servo grease flung off the gears.
After many years importing/distributing and repairing many brands of servo, (also own 200+ mixed)
have never seen a servo with any form of thermal compound spread around the motor itself,
except in those high performance, especially high voltage, digital servo which have a close fitting metal heatsink
which was not mentioned in OP, in which case a heatsink compound aka Thermal Grease, types as shown under Wiki, and as used in a PC will suffice...
Alternate references:
. 101 - Servo Repair - Finless Bob's Video
. Servo - FAQ : Metal Gear Servos - DIY Repair & Extend MG Servo Gear Life
. Servo - How to Diagnose Servo Failures & Repair Servo *
. Use of thermal paste with Servo Heatsink

Much more information available under sub sections:
"Servo - Alterations, Calculators, Databases, Leads, Repairs, Convert to an ESC or winch & FAQ."
below
"Radio Systems, Accessories, Alterations and FAQ" at
Alan's Hobby, Model & RC FAQ Web Links

Later:
My apologies to all, I missed post #4 which advises the servo is a "rhino digi4" which does not have a heatsink. - refer above details.
However, if it is the newer Multiplex RHINO pro HV digi 4 then this is a new hi peformance
servo which, like many similar high performance/voltage digital Hitec RCD servo, does indeed have a heatsink to cool the motor, see thermal paste link above.
Whilst Hitec lists servo grease, neither Hitec or Multiplex list thermal compound on the service parts list

Alan T.
Alan's Hobby, Model & RC FAQ Web Links

tizdaz

just an update, my servo is a rhino digi 4, but sorted now, it was as I suspected, a thermal paste to that ised on heatsinks on pc components :-)

redfisher1974

I agree a great source of info.