Mine Safety and Health Administration (MSHA) … Simplified Machine/Electrical Checklist for Part 36 Approval Applications
Simplified Machine/Electrical Checklist for Part 36
Approval Applications
U.S. Department of Labor
Mine Safety and Health Administration
Approval and Certification Center SAMPLE
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THIS BLOCK FOR MSHA USE ONLY
ME # _________________
REV LEVEL ___________
MACHINE/ELECTRICAL CHECKLIST


Make and Model No. ____ABC Inc. Model 997____
Machine Type ______Load-Haul-Dump Unit_______
If an MSHA Part 36 approval plate has been affixed to this machine, it must meet the requirements of Part 36, Title
30, Code of Federal Regulations. It is the responsibility of the user to ensure that this machine is maintained in
permissible condition in accordance with this checklist.
ALL INSPECTIONS AND TESTS SHALL BE PERFORMED IN FRESH AIR.
PERMISSIBILITY:
1.
For a complete permissibility evaluation, this checklist must be used in conjunction with a power system
checklist.
2.
The design of the exhaust conditioner limits permissible operation to grades not exceeding __12__%.
3.
Due to braking capability limitations, this machine shall not be operated on grades greater than __25__%.
NOTE: When operated in areas which do not require permissible machines, this machine can be operated
on grades greater than the __12__% grade limitation due to the design of the exhaust conditioner,

Manufacturer's Drawing No. _______________ Rev. _____ ,
but in no case can the machine be operated on grades greater than __25__%, due to braking
capability limitations.
4.
The approval plate specifies a ventilation rate of ______ CFM.
Manufacturers Drawing No. ______________________ Rev. ____________ SAMPLE
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A.
FUEL SYSTEM:
1.
( )
There are no fuel leaks.
2.
( )
The fuel filler cap (1)* is vented and the vent is not plugged (see Figure 1).
3.
( )
The fuel filler cap is self-closing and is attached to the tank in a manner which will
prevent loss during refueling.
Figure 1
*Referenced items shown on Machine Layout Diagram.
4.
( )
Auxiliary fuel tank capacity has not been added to the vehicle.
5.
( )
Fuel filters (2)* are properly installed and are not damaged.
6.
( )
The fuel injection rate adjustment mechanism (3)* and the engine governor setting are
locked and sealed (see Figure 2). SAMPLE
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Figure 2
*Referenced items shown on Machine Layout Diagram.
7.
( )
The fuel shutoff valve (4)* in the fuel supply line is operable.
8.
( )
The drain plug (5)* in the fuel tank is locked in position. (Pipe plugs are considered
"locked in position" when tight.)
NOTE: The following checks may be performed if the fuel lines have been repaired or replaced.
9.
( )
Fuel lines are not routed near or connected to hot exhaust components and are protected
from external damage.

10.
( )
Fuel lines are secured
*Referenced items shown on Machine Layout Diagram. SAMPLE
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B.
BRAKING SYSTEM:
WARNING:
Brake tests are to be conducted on a relatively level surface, away from traffic areas where other
machines or persons may be moving about. Consider the possible consequences of testing a
machine with assumed braking inadequacies, and select an area where the test machine would not
cause an accident due to these inadequacies.
1.
( )
Service Brake Test.
a.
With the engine operating and the machine stationary, apply the service brake.
b.
Release all other brakes.
c.
Place the transmission gear selector in __second__ gear and the directional control
selector in forward or reverse.
d.
Depress the accelerator to full throttle, allowing the engine to put the transmission torque
converter into a stall condition.
If the service brake is operating satisfactorily, the unit will not move when the above procedure is
followed. If movement is detected, the service brake must be repaired or adjusted.
2.
( )
Parking Brake Test.
a.
With the engine operating and the machine stationary, apply the parking brake (6)*.
*Referenced items shown on Machine Layout Diagram.
b.
Release all other brakes.
c.
Place the transmission gear selector in __third__ gear and the directional control selector
in forward or reverse.
d.
Depress the accelerator to full throttle, allowing the engine to put the transmission torque
converter into a stall condition.
If the parking brake is operating satisfactorily, the unit will not move when the above procedure is
followed. If movement is detected, the parking brake must be repaired or adjusted.
NOTE 1:
As applicable, detailed override procedures are to be included in this section to
effectively evaluate parking brake capability.
NOTE 2:
Gear selection for these tests must insure service and parking brake capability
equal to or greater than the maximum specified gradeability of the machine. SAMPLE
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C.
ELECTRICAL LIGHTING SYSTEM:
ALL ELECTRICAL ENCLOSURES MUST MEET THE FOLLOWING:
1.
( )
All electrical enclosures (i.e., alternator (7)*, headlight switch (8)*, headlight (9)*) have
an MSHA plate attached that is clearly stamped with an MSHA certification number.
*Referenced items shown on Machine Layout Diagram.
2.
( )
All electrical enclosures are securely mounted and all vulnerable electrical components
are protected from physical damage.
3.
( )
All electrical enclosures are intact (not cracked or broken); the headlight lenses are not
loose. All shaft and/or pushbutton controls are operable.
4.
( )
All threaded covers are secured from loosening by a locking screw, wire, or other means.
5.
( )
Lockwashers or equivalent devices are provided for all bolts, screws, or studs that secure
parts of the explosion-proof enclosures. All bolts, screws, and studs are in place and
tightened.
6.
( )
None of the fastenings used for joints on the explosion-proof enclosures are used for
attaching non-essential parts or for making electrical connections.
7.
( )
All joints forming the flame arresting paths (flanges and covers) are smooth and free
from rust, corrosion, and pitting.
8.
( )
Use feeler gauges of the appropriate size to insure the clearances in all accessible flame
path joints, between the enclosures and corresponding covers, are not exceeded
9.
( )
Headlight(s) is/are installed at each end of the machine and operable.

10.
( )
Headlight switch must not control or operate any electrical circuits other than headlights.

11.
( )
All lead entrances (packing glands) are assembled so that the cable jacket penetrates into
the enclosure and when tightened, a 1/8" minimum clearance remains between the
packing nut and stuffing box. All packing nuts and stuffing boxes are secured from
loosening by a locking screw, wire, or other means

12.
( )
All unused lead entrances are closed with metal plugs which are secured in place by spot
welding, brazing, or equivalent
IF CABLES CONNECTING ELECTRICAL COMPONENTS ARE REPAIRED, REPLACED, OR OTHERWISE
DISTURBED, THEY MUST CONTINUE TO BE:
13.
( )
Clamped in place to prevent undue movement. SAMPLE
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14.
( )
Protected from mechanical damage by position, flame resistant hose conduit, metal
tubing, or troughs.
NOTE: Flexible or threaded rigid metal conduit is not acceptable.
15.
( )
Not subject to abrasion from sharp corners or edges.
16.
( )
Isolated from hydraulic lines and hydraulic components.
17.
( )
Isolated from fuel lines.
18.
( )
Flame resistant if not enclosed in hose conduit. This is indicated by "MSHA" markings
on the cable.
19.
( )
If hose conduit is used, it must be securely clamped at both ends and MSHA markings
appear as "Flame-Resistant, US MSHA, US MESA, or USBM 2G-(__152__)."
NOTE: The following check may be performed when an electrical enclosure has been disassembled for
whatever reason, or if there is cause to believe a problem exists within the enclosure.
20.
( )
Provided with short circuit protection for each power conductor.
21.
( )
Electrical connections inside the electrical enclosures are secure (not loose) and are
insulated where space is limited. The ground conductors are not broken and are securely
attached.
D.
METHANE MONITOR SYSTEM (IF SO EQUIPPED)
NOTE: For machines equipped with a methane monitoring system, the following checks apply. These
checks are given as an example; actual checks should be based on the individual system used and
the manufacturer's recommendations.
1.
( )
The power supply (10)* and amplifier readout (14)* components bear a label or plate
indicating the methane monitor system Certification No. 32A-XXXMD .
*Referenced items shown on Machine Layout Diagram.
2.
( )
All explosion-proof enclosures in the methane monitoring system meet the checks noted
for electrical enclosures stated in Section C, Electrical Lighting System.
3.
( )
The methane monitor solenoid valve assembly is installed in the machine's safety
shutdown system in the same area and manner as the other safety shutdown devices
which automatically shut off the fuel supply to the engine when activated. SAMPLE
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4.
( )
The sensor head (13)* is mounted in an area where it will not be exposed to a continuous
water spray and where a free flow of air from the mine face is available. Also, the vent
holes and filter(s) on the sensor head are not clogged with water, dust, or other material
*Referenced items shown on Machine Layout Diagram