Groen TDB 48A, Operator'S Manual

16 OM-TDH/TDHC

Maintenance

NOTICE:   Contact an authorized representative when repairs are required.

A Maintenance & Service Log is provided at the back of this manual. Each time 

maintenance is performed on your kettle, enter the date on which the work was done, 

what was done, and who did it.  Keep this manual on file and available for operators to 

use. Periodic inspection will minimize equipment down time and increase the efficiency 

of operation. The following points should be checked: 

A. 

Jacket Vacuum/Removing Air from Jacket (by Operator)

Every day, while the kettle is cold, read the pressure/ vacuum gauge. A positive 

reading or a negative reading between zero and 20” vacuum on the pressure/ 

vacuum gauge indicates excess air in the jacket. Air in the jacket slows kettle 

heating and can prevent the kettle from reaching operating temperature. 

To remove air:

1.    Start the unit. (See “Operation” section).

2.    Make sure the elbow on the outlet of the pressure relief valve is turned so 

that escaping steam is directed down toward the floor. Be sure and follow 

the instructions on the attached pressure relief valve tag.

3.    When the pressure/vacuum gauge reaches a positive pressure reading of 

5 PSI, release trapped air by lifting the pressure relief valve ring for about 

one second. Repeat this step, then let the valve ring snap closed, so the 

valve will seat properly and not leak.

B. 

Pressure Relief Valve (by Operator)

At least twice a month, test the pressure relief valve. Test the valve with the 

kettle operating at 15 PSI (105 kPa), by holding the test ring for at least five 

seconds. Then release the ring and permit the valve to snap shut. If the ring does 

not activate, if there is no discharge, or if the valve leaks, stop using the kettle 

immediately and contact a authorized service representative.

C. 

Grease / Lubrication (by Service)

Hand Tilt Models: At least twice a year, grease the two trunnion bearings. The 

bearings are located within the kettle support housing. Remove the access 

panels from the support housing with a screwdriver to gain access to the 

grease fittings. Use a lithium-based, multi-purpose grease. When the access 

panels are removed, the mounting bolts for the trunnion bearings and tilt switch 

can also be checked for tightness. When finished, reassemble access panels to 

support housing.

Crank Tilt Models: The gear housing has been fitted for proper lubrication of 

moving parts. Since the gears do not run in oil, periodic lubrication with grease 

is essential. Frequency of lubrication depends on operating conditions, but 

should occur at least once every six months. The use of a Number Two grade 

LGI lithium grease is recommended. Add grease through the Zerk fittings on the 

gear housing until grease flows out of the bearings around the trunnion shaft. 

Place a liberal amount of grease on the gear to cover the arc that is in contact 

with the worm gear.

WARNING

AVOID ANY EXPOSURE TO THE STEAM

BLOWING OUT OF THE PRESSURE

RELIEF VALVE. SEVERE BURNS CAN

RESULT ON EXPOSED SKIN.

FAILURE TO CHECK PRESSURE RELIEF

VALVE OPERATION PERIODICALLY

COULD RESULT IN PERSONAL INJURY

AND/OR DAMAGE TO EQUIPMENT.

Make sure that the 

open end of the elbow 

on the pressure 

relief valve is directed 

downward.

The pressure gauge 

should show a 

vacuum of 20 to 30 

inches when the 

kettle is cold. 

CAUTION

KEEP GREASE AWAY FROM ELECTRICAL

PARTS LOCATED NEAR THE GEARS.