Ingersoll-Rand 7792-A Maintenance Dissassembly Head Disassembly, Pendent Control Disassembly

Maintenance

Dissassembly

Head Disassembly

To remove head section from housing without disassembling head components, remove head with control rod (59) attached to gear (25). To accomplish this -

-Remove two screws (96) and housing cap (95).

-Drive out roll pin (61) and remove brake block (60).

-Drive out roll pin (69) from control arm (68).

-Remove six screws (22) and washers (23).

-Remove head section and control rod from housing as one unit.

To disassemble head components without removing head section from hoist:

-Remove two screws (96) and housing cap (95).

-Drive out roll pin (69) from control arm (68).

-Drive out roll pin (26) from gear (25) and drive control rod (59) back thru gear (25) and remove gear.

-Remove adapters (19), valves (17) and (29) and valve body (15).

-Remove set screws (24) and regulator valves (28).

CAUTION

do not attempt to adjust or remove regulator valves (28) from spark-resistant hoist models - these valves are pre-set at fatctory.

-Remove adapter (1) and screen (2).

-Remove retaining ring (4), swivel (3), swivel body (6) and screen (8).

-Remove two screws (9), washers (10), exhaust deflector (11), screen (12) and muffler filler (13).

STEP 1 :- POSITION HOIST SO YOU ARE FACING END WITH AIR INLET, WITH VALVE PARTS AND GEAR [25] REMOVED, PLACE VALVE BODY IN VALVE OPENING. INSERT FINGER IN EACH END OF VALVE OPENING AND ALIGN END OF VALVE BODY WITH ENDS OF BUSHING.

NOTE: VALVE BODY MUST BE INSTALLED WITH IDENTIFICATION MARK AS SHOWN.

ENDS OF VALVE BODY FLUSH WITH BUSHING

UP DN	TIMING GROOVES
	ON VALVE BODY

IDENTIFICATION MARK "x" ON END OF VALVE BODY

STEP 2 :- WITH BRAKE RELEASE BLOCK ASSEMBLED TO CONTROL ROD, INSERT ROD THROUGH BRAKE END OF HOUSING, THROUGH CONTROL ARM [68] AND ON THROUGH HOUSING STOPPING BEFORE ROD PROTRUDES FROM HEAD.

ASSEMBLE GEAR [25] TO HEAD ALIGNING CENTER TOOTH OF GEAR BETWEEN TWO GROOVE MARKINGS ON THE VALVE BODY AS SHOWN.

ASSEMBLE CONTROL ROD THROUGH GEAR AND SECURE WITH ROLL PIN [26]. SECURE CONTROL ARM TO ROD WITH ROLL PIN [69].

UP DN

GEAR [25]

STEP 3 :- ASSEMBLE O-RINGS [16] TO VALVES [17] AND [19] AND ASSEMBLE VALVES INTO HEAD AS SHOWN. ASSEMBLE O-RINGS [18] TO ADAPTERS [29] AND O-RINGS [20] TO VALVE CAPS [21] AND ASSEMBLE TO HEAD.

UP DN

Form 10590149-Edition 2

NOTE: When reassembling head to housing a new Gasket

(31)must be installed. Tighten Screws (22) to approximately 60 in-lbs. torque. When tightening these screws it is recommended that an air line be attached to the air inlet and the hoist operated to insure that no binding of the motor occurs. Tighten screws alternately and gradually until desired torque is reached without binding of motor. Lubricate all O-Rings with O-Ring lube (36460) before assembling. Insure O-Ring (32) is properly positioned in head.

-Assemble valve body (15) into head - see “Timing of Head”, this page.

-Assemble o-rings (27) to regulator valves (28).

-Assemble regulator valves (28) to head and secure with set screws (24). NOTE: groove in regulator valve must be aligned to accept set screw. See setting hoist speed, page 2.

-Assemble muffler filler (13), screen (12) and exhaust deflector (11) to head and secure with washers (10) and screws (9).

-Clean and assemble screen (8) to head.

-Assemble o-rings (5) and (7) to swivel body (6) and assemble body to head.

-Assemble swivel (3) to swivel body and secure with retaining ring (4).

-Clean and assemble screen (2) and inlet adapter (1) to swivel.

-Fill oil reservoir in head with spindle oil 29665.

Pendent Control Disassembly

-Remove pendent hoses from fittings (156) and (165).

-Remove adapter (166) from head releasing strain cable.

-Remove screws (168), springs (170) and valves (171).

Pendent Control Assembly

-Lubricate o-rings (172) and assemble to valves (171).

-Assemble valves (171) and springs (170) to handle.

-Lubricate o-rings (169) and assemble to screws (168).

-Assemble screws (168) to handle securing valve components.

Pendent Cylinder Disassembly

-Unthread cylinder (157) from adapter (163).

Pendent Cylinder Assembly

-Assemble piston rod (160) to piston (159).

-Lubricate and assemble o-ring (158) to piston (159).

-Lubricate and assemble o-rings (162) and (164) to adapter (163).

Motor Disassembly

-Remove head section - see “Head Disassembly”.

-Remove motor from housing.

-Remove retaining ring (36); motor assembly will come apart,

Motor Assembly

-Lubricate bearings (37) with NLGI #1 “EP” grease (33153) and assemble bearings to end plate (38) and

(43)- shielded side of bearing facing out.

-Assemble end plate (43) to spindle (45) and slide up to shoulder of spindle.

-Assemble key (44) to key slot in spindle (45).

-Assemble rotor (41) over spindle aligning key way and key (44).

-Assemble cylinder (39) over rotor (41) and insert blades (42) into blade slots of rotor - straight side of blade out.

-Assemble end plate (38) to spindle and align hole in end plate with roll pin (40).

-Secure assembled parts to spindle with retaining ring

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