Grindmaster G & MG Series User Manual

A preventive maintenance visit should be performed every 3
months. Failure to complete PM’s every 3 months is considered abuse of the machine, and therefore voids the war-
ranty. Proof of PM must be documented with Grindmaster Corporation to maintain warranty coverage. To document
your PM, complete this form with signatures, place used/worn parts that were replaced during the PM inside enve-
lope, and mail to Grindmaster Corporation. Parts returned should include 2 spindle bushing evaporator seals, 2 rub-
ber bell shaped shaft seals, valve o-rings and shafts (if applicable). 

The following procedures should be performed during a Preventative Maintenance visit, using PM kit # 90104:

 

Document model and serial number of equipment and record above.

 

Check product temperature and consistency for proper setting - adjust if necessary.

 

Insure product is being mixed properly and is within specification (check and document brix - most products 

should be around 13% - refer to product manufacturer’s recommendations for exact recommended brix). 
Record Brix reading here: Left Bowl _____   Right Bowl _____

 

Check for leaks at gaskets, o-rings, front shaft seal, etc.

 

Empty product from bowls. 

 

Disassemble unit completely.

 

Clean and sanitize all disassembled parts.

 

Clean and sanitize top tray and freezing barrel.

 

Clean out condensation tube with sanitizer and long brush.

 

Check condition of all panels, bowls, lids - replace if necessary.

 

Check mixing rods and augers for wear, check mixing rod bearing for wear - replace if necessary.

 

Check for bowl knobs (two per bowl to lock down bowl in front) - replace if necessary.

 

Check operation of lights in lid and rear of unit (if equipped) - replace light bulbs if necessary.

 

Clean re-usable air filter if so equipped (standard on G & MG models, optional on ID models). Check condition 

of filter and replace if necessary.

 

Clean condenser.

 

Check condition of bowl gasket and replace if necessary.

 

Replace all o-rings on dispense valves and lubricate.

 

Check drive shaft. If surface is not smooth or the drive shaft is not secure (excessive movement in and out) use 

PM kit #90110, or 90110B in place of 90104 above.

 

Replace spindle bushing seal in front of evaporator using extraction tool.

 

Replace bell shaped rubber shaft seal on front of freezing barrel (generously lubricate inside seal)

 

Lubricate parts where appropriate (dispense valve o-rings, inside of shaft seal, inner rim of bowl where it meets 

with the bowl seal)

 

Re-assemble unit and refill with product

 

Verify and document defrost timer setting and operation and time of day setting and adjust if necessary.

 

Check thermostat setting on ID and MG models. Thermostat setting should be between 1-1/2 and 2.

 

Verify compressor operation and freezer controller operation.

 

Verify ventilation is adequate (8” on both sides and back).

 

Check electrical connections and wiring.

 

Check fan operation (1 condenser fan and 2 gear motor fans) and clean fan or blades if necessary.

 

Review proper periodic care and cleaning instructions (disassembly, cleaning, sanitizing, lubrication and 

re-assembly) with store personnel. Review proper product mixing and handling instructions with store personnel.
Demonstrate and train store personnel to follow proper procedures (stress importance of store level 
maintenance such as lubrication and filter cleaning).

 

Make sure store personnel have appropriate supplies (lubricant and sanitizer) to care for machine.

Model # ___________________________
Serial # ____________________________
Date: ______________________________
PM by _____________________________
Of Company ________________________

Store Name/# ______________________
Address ___________________________
__________________________________
Store Mgr Name ____________________
Signature __________________________