<£rosman
Contents
1. Y Slide Hammer Assembly 760B099 Ham mer Spring 760 080 and Tube Plug 760 081 into rear of Pump Tube 760 094 Properly line up Tube Plug 760 081 with Hole in Pump Tube 760 094 Place Bolt Lever 760 091 in slot on top of Bolt Assembly 760 098 Place Bolt Assembly 760 098 on top of Pump Tube 760 094 and over Hammer cocking pin on Hammer Assembly 760B099 Cocking pin must be in slot of Bolt Assembiy 760 098 so that Hammer Assembly 760B099 can cock properly As one unit place Pump Tube 760 094 and Bolt Assembly 760 098 into Left Hand Receiver 760 096 making sure locating hole in Pump Tube 760 094 is over boss on Left Hand Receiver 760 096 Pull Bolt Assembly 760 098 back slightly to check for tension and proper location f Assembly Trigger and Sear Group VIII and Receiver Group VI per Assembly instructions in those sections X VALVE AND TUBE GROUP A DISASSEMBLY NOTE Groups Ill VI VIII and IX must be re moved to work on this unit Ta 2 Remove Breech Gasket 130 036 from ex haust hole in Pump Tube 760 094 With Y2 rod or dowel gently push out from rear of the pump Tube 760 094 Valve Assembly 760A101 Disassemble Valve Assembly 760A101 as follows CAUTION Be sure all air is exhausted from Valve Assembly 760A101 Tap Valve Stem on bench to make sure all air is exhausted a Grip Valve Body 760 075 with a pair of vise grips b Apply a small amount of heat at ce2. 4 If new Detent Plug 760 063 is not aVailable compress Lever Link Assembly 7604043 opening with pliers so that inside of Lever Link Assembly 760A043 will be tightened against Detent Plug 760 063 PROBLEM VI Fails T Shoot Pellets or BBs POSSIBLE CAUSES REPAIR PROCEDURES dis 1 Barrel 760 083 is jam 1 See Disassembly Assembly med with BBs or Pellets Procedures Barrel Group IV 2 Inspect inside of Barrel 760 093 to make sure that outer shells of Pellet is not in Barrel and that no other obstructions are visible 3 Inspect for jammed BBs Over sized or reused BBs may be the cause of jamming NOTE Customer should be advis ed that Crosman Super BBs should be the only ammunition us ed and that reused BBs may jam gun i O M u Ra PROBLEM VII Gun Fails To Cock POSSIBLE CAUSES REPAIR PROCEDURES 1 See Disassembly Assembly Procedures Trigger and Sear Group VIII 2 Inspect Sear 760 084 and replace if necessary 1 See Disassembly Assembly Procedures Trigger and Sear Group VIII 2 Inspect Trigger Spring 761A005 and replace Assembly if necessary 1 Worn or defective Sear 760 084 Disconnected or impro perly installed Trigger Spring 761A005 PROBLEM VIII BBs Fail To Drop Into Chambers POSSIBLE CAUSES REPAIR PROCEDURES 1 See Bolt Lever Bolt Assem bly an
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4. A Coleman Division This manual is intended as an informational guide in servicing Crosman products It is not instructional material and we therefore assume no responsibility for those who use same without proper factory training CROSMAN ARMS 980 Turk Hill Road Fairport New York 14450 SM 760HD PS anm m Crosman MS M MODEL 760 HAMMER DROP SERVICE General operating instructions for this model are contained in the Owner s Manual and should be read thoroughly The detailed drawings repair instructions and Disassembly Assembly pro cedures must be studied carefully before any repair work is started This will insure quicker and more precise repair of qun TROUBLE SHOOTING PROBLEM Gun Will Not Fire POSSIBLE CAUSES REPAIR PROCEDURES 1 Interlock 760 087 da maged or not working properly 1 See Disassembly Assembly Procedures Receiver Group VI 2 Inspect Interlock 760 087 for wear or damage 3 If necessary to replace pry off Interlock Retainer 760A090 and remove Interlock Spring 760A088 Interlock 760 087 and Interlock Bushing 760 089 1 If Bolt Lever 760 081 is open or not completely closed it will inter fere with Interlock 760A087 and prevent gun from firing 2 Bolt Lever 760 091 is open or not completely in closed position ROBLEM ll Leaks REPAIR PROCEDURES POSSIBLE CAUSES 1 See Disassembly Assembly Procedures Valve and Tu
5. ASSEMBLY 1 Replace Barrel 760 093 NOTE When replacing Barre 760 093 be sure that detent spot in Barre 760 093 is located properly over Set Screw holes for proper alignment 2 Replace rear and front Set Screws 760A027 3 Replace Rear Sight 160 020 Elevator 160 021 and Rear Sight Screws 160 029 NOTE Rear Sight Assembly must be replaced before test firing BB PORT COVER GROUP A DISASSEMBLY 1 Turn BB Port Cover 760 082 counterclock wise and pry it out B ASSEMBLY 1 Place BB Port Cover 760 082 over hole and press into place RECEIVER GROUP A DISASSEMBLY 1 Remove Bolt Knob 760 050 2 Remove two 2 Receiver Screws 760 025 and one 1 Receiver Screw 110 049 3 Place Bolt Lever 760 091 in upright posi tion and lift off Right Hand Receiver Assembly 7604102 Inspect parts inside Right Hand Receiver Assembly 760A102 If necessary pry off Interlock Retainer 760A090 and remove Interlock Spring 760A088 Interlock 760 087 and Interlock Bushing 760 089 Replace worn parts B ASSEMBLY T Replace Interlock Assembly into Right Hand Receiver 760 095 in reverse order of disassembly NOTE Before replacing Right Hand Receiver Assembly 760A102 make sure that all parts located in Left Hand Recei ver 760 096 are in proper position Pull back Bolt Lever 760 091 and Bolt Assem bly 760 098 so that Sear 760 084 latches on last click in cocked position This will move Bolt Assembly 760 098 away from Interloc
6. ar boss Slide Trigger Assembly 760A100 over Trig ger Pivot Pin 760 016 and hook Trigger Return Spring 760 104 on top rear of Trig ger Assembly 760A100 NOTE Test Trigger Assembly 760A100 for spring tension Place Trigger Pivot Pin 760 016 in hole for ward of Trigger Assembly 760A100 Place Sear 760 084 over Pivot Pin 760 016 and make sure hole in Sear 760 084 is located over Pivot Pin 760 016 on Trigger Assembly 760A100 Hook Trigger Spring 760A005 in small hole in Sear 760 084 and at same time slide Trigger Spring 761A005 over Pivot Pin 760 016 Allow Trigger Spring 761A005 to rest against casting and over Safety hole Slide Safety 760 017 in from left side of Left Hand Receiver 760 096 moving Trig ger Spring 761A005 forward so that it will hold the Safety 760 017 in place IX BOLT LEVER AND BOLT ASSEMBLY AND HAMMER GROUP A DISASSEMBLY NOTE It is only necessary to remove Groups VI and VII to work on this group E Lift Barrel 760 093 Pump Tube 760 094 Lever Link Assembly 76A043 Bolt Assem bly 760 098 and Bolt Lever 760 091 as one unit from Left Hand Receiver 760 096 Remove Bolt Assembly 760 098 and Bolt Lever 760 091 from Pump Tube 760 094 Slide from rear of Pump Tube 760 094 the Tube Plug 760 081 Hammer Spring 760 080 and Hammer Assembly 760B099 NOTE All parts should be inspected for damage wear or any other defect and re place if necessary B ASSEMBLY
7. be Group X 2 Valve Stem Assembly 1322 011 must be replaced if damaged or defective 1 If Lever kicks back when pump ing gun it will indicate that the Check Valve 1400A028 is defec tive 2 See Disassembly Assembly 1 Defective Valve Stem Assembly 1322 011 2 Defective Check Valve 1400A029 Procedures Valve and Tube Group X 3 Replace Check Valve 14004029 It is not always necessary to disassemble the entire gun in repair work it is hoped that this sec tion will assist you in diagnosing the repair pro blem and will speed up repair time PROBLEM III Low Power POSSIBLE CAUSES 1 Seal on Valve Stem Assembly 1322 011 is distorted allowing too little air pressure into Exhaust Hole 2 Valve Leaks 3 Compressed or defec tive Pump Cup 766 035 4 Defective or missing Gasket 130 036 5 Connecting too short and will not compress air in Valve Assembly Rod Assembly 1322 019 is REPAIR PROCEDURES 1 See Disassembly Assembly Procedures Valve and Tube Group X 2 Check Seal on Valve Stem Assembly 1322 011 and replace entire Assembly if necessary 1 See Problem Leaks Trou ble Shooting Section 1 See Disassembly Assembly Procedures Lever and Pump Group IH 2 Inspect and replace Pump Cup 766 035 if necessary 1 See Disassembly Assembly Procedures Valve and Tube Group X 2 Replace Breech Gasket 130 036 if n
8. ce Barrel 760 093 if necessary 1 See Disassembly Assembly Procedures Barre Group IV 2 Inspect Barrel Support 760 074 and replace if necessary 1 Defective Barrel Chamber 2 Burrs on Exhaust hole on Barrel Support 760 074 1 Put together Connecting Rod Assembly 1322 019 and Pump Cup 766 035 2 Place Pump Guide Pin 101 033 through Connecting Rod Assembly 1322 019 and Lever Link Assembly 760A043 3 With Pump Assembly parts together slide the unit into Pump Tube 760 094 4 Test for compression before continuing assembly Place punch through hole in Pump Tube 760 094 and Pivot Pin 760 071 hole on Lever Remove Unit from vise pump gun and fire to check for proper operation If operation is correct continue to next step Otherwise recheck steps 1 3 5 With Lever open about 2 place Pump Tube 760 094 back in vise 6 Slide front Barrel Guide 760B008 back onto Pump Tube 760 094 7 Carefully drive Pivot Pin 760 071 through Pump Tube 760 094 and Lever Link Assembly 760A043 and replace Pivot Pin Retainer 760 072 8 Remove from Vise and replace Front Set Screw 760A027 IV BARREL GROUP VI A DISASSEMBLY NOTE Barre 760 093 can be removed with out disassembling Group and IN 1 Remove two 2 Rear Sight Screws 160 029 Rear Sight 160 020 and Elevator 160 021 2 Remove rear and front Set Screws 760A027 3 Slide out Barrel 760 093 and unjam or replace if necessary B
9. d Hammer Group IX 2 Inspect Bolt Assembly 760 098 and replace if necessary 4 See Disassembly Assembly Procedures Receiver Group V1 2 Inspect Chamber and Magazine and clear areas 1 Magnet on Boalt Assembly 760 098 is too long or loose 2 Foreign material or Pellets in BB Cham ber or Magazine PROBLEM IX BBs Roll Out Of Magazine When Bolt Is Pulled Back BBs Roll Back Into Reservoir REPAIR PROCEDURES 1 See Disassembly Assembly Procedures Bolt Assembly and Hammer Group IX 2 Replace Bolt Assembly 760 098 if magnet is missing See Disassembly Assembly Procedures BB Retainer Group VI 2 Remove Right Hand Receiver 760 095 replace BB Retainer 7604021 POSSIBLE CAUSES 1 Magnet on Bolt Assembly 760 098 is missing 2 BB Retainer 760A021 is broken or worn PROBLEM X BBs Roll Out Of Barrel When Bolt Is Closed REPAIR PROCEDURES POSSIBLE CAUSES 1 Magnet on Bolt Assembly 760 098 is weak or missing 1 See Disassembly Assembly Procedures Bolt Lever Bolt Assembly and Hammer Group IX 2 Replace Bolt Assembly 760 098 if magnet is weak or missing PROBLEM XI Pellets Move Into Barrel Chamber With Difficulty POSSIBLE CAUSES REPAIR PROCEDURES 1 See Disassembly Assembly Procedures Barrel Group IV 2 Inspect Chamber of Barrel 760 093 for burrs deformities and foreign matter 3 Repla
10. ecessary 1 One way to check for this cause is to pump gun two times and fire If gun does not expel pellet then connecting Rod Assembly 1322 019 may need to be replaced 2 See Disassembly Assembly Procedures Lever and Pump Group I PROBLEM IV Gun Fails To Exhaust Air POSSIBLE CAUSES 1 Gun has been over pumped REPAIR PROCEDU RES 1 If gun pumps very hard compression build up will indicate gun has been over pumped not allowing Hammer to exhaust any air 2 See Disassembly Assembly Procedures Valve and Tube Group X NOTE Place Valve Assembly 760A101 on bench with Valve Stem Assembly 1322 011 facing up and exhaust hole away from you Then hit Valve Stem Assembly 1322 011 thereby ex pelling the air 2 Distorted Seal or 1 See Disassembly Assembly Compressed ring on Procedures Valve and Tube Valve Stem Assembly Group X 1322 011 2 Inspect Seal on Valve Stem Assembly 1322 011 and replace if necessary NOTE Before turning Valve Assembly 769A101 apart follow instructions as given in Repair Procedures of Problem IV 1 PROBLEM V Lever Does Not Stay In Locked Position POSSIBLE CAUSES REPAIR PROCEDURES 1 Worn Detent Plug 1 See Disassembly Assembly 760 063 Procedures Lever and Pump Group lll 2 Inspect Detent Plug 760 063 and replace if necessary 3 Toreplace Detent Plug 760 063 punch it out of Lever Link Assembly 760A043
11. k 760 087 Replace Right Hand Receiver Assembly 760A102 NOTE If difficulty is encountered in assembling Right Hand Receiver 760A102 check to see if Barrel Support 760 074 is lined up with hole in Right Hand Receiver 760A102 It is helpful to put Lever Assem bly in open position and to make sure that Bolt Assembly is back completely Vil BB RETAINER GROUP A DISASSEMBLY 1 NOTE To repair this group itis necessary to remove Receiver Group VI Remove BB Retainer 7604021 see Receiver Group VI NOTE If BB Retainer 760A021 moves back and forth too freely this will indicate that detent button on BB Retainer 760A021 is broken or worn and part must be replaced Vill TRIGGER AND SEAR GROUP A DISASSEMBLY NOTE To repair this part of gun it is only necessary to remove Receiver Group VI and BB Retainer Group VII Y 5 Pry Trigger Spring 761A005 forward and remove Safety 760 017 from Left Hand Receiver 760 096 Lift Trigger Spring 761A005 from Trigger Assembly 760A100 and unhook from Sear 760 084 Pull out Trigger Pivot Pin 760 016 from Sear 760 084 and remove Sear 760 084 Lift out Trigger Pivot Pin 760 016 from Left Hand Receiver 760 096 and remove Trigger Assembly 760A100 Remove Trigger Return Spring 760 104 B ASSEMBLY s Replace Trigger Return Spring 760 104 over rear Trigger boss with hooked end down and to rear of casting as shown in EV P Place Trigger Pivot Pin 760 016 in re
12. nter of Valve Assembly 760A101 to loosen Locktite c With a pair of pliers loosen two parts 760 075 and 130B005 of the Valve Assembly 760A101 and separate d Remove Valve Stem Assembly 1322 011 check Valve Spring 760 103 Valve Spacer 760 086 and Check Valve 1400A029 e Remove O Rings 130 034 and 130 035 from Check Valve Body 130B055 B ASSEMBLY NOTE Before reassembly inspect all parts for wear or damage It is recommended that O Ring 130 034 and 130 035 Check Valve 1400A029 and Valve Stem Assembly 1322 011 be replaced with new parts T 2 Place O Rings 130 034 and 130 035 on Check Valve Body 130B005 Reassemble Valve Stem Assembly 1322 011 Check Valve Spring 760 103 Valve Spacer 760 086 and Check Valve 1400A028 into Valve Assembly 760A101 as shown on E V P Apply a small amount of Locktite to thread on Check Valve Body 130B005 and turn two valve parts together and tighten with pliers Slide Valve Assembly 760A101 into Pump Tube 760 094 NOTE Be sure to line up exhaust hole in Valve Assembly 760A101 with exhaust hole in Pump Tube 760 094 Replace Breech Gasket 130 036 in ex hause of Pump Tube 760 094 Then put pump tube in vise upside down with about one inch of front end of the tube protruding from vise jaws Slide pump piston and lever assembly as one unit into pump tube Then place front bar rel guide 760B008 in end of tube and properly line up all holes and replace pivot pin
13. through tube barrel quide and lever pivot hole F Slide Barrel 760 093 through Barrel Guide 760B008 Place Barrel Support 760 074 as shown on E V P on Barrel 760 093 making sure it Is properly located over detent spot on Barrel Replace Set Screw 760A027 and tighten Place Barrel Support 760 074 in exhaust hole on top of Tube on Breech Gasket 130 036 Line up detent spot properly over hole in Front Barrel Guide 760B008 replace Set Screw 760A027 and tighten Assemble as instructed in Bolt Lever and Bolt Assembly Group IX B and then com plete the reassembly of all the above groups 6C Date of Manufacture 7668110 mi 7688102 i Dec 1988 5 Make sure to first check serial number desta Y Starts DBL00000 7 a on gun this will be helpful in ordering the correct parts a Tei A Lj p 66C020 M 66SB 020 66A018 66 016 7606078 gt 7608125 Pr d P 760 140 77 i M SS AN T i Lea 7608121 AS 760A021 eT We 66SB 009 66RT 009 760 018 665B 013 66RT 013 130 036 1322C020 66A027 D bbRT 005 760005 66C FIGURE 111 C 760Y004 p raae A MODEL 66BX 664SB 664GT 70665SB 660020 665B 021 6645B 10060 6638 009 6645p 11322 6640T gt o 4 22 eee 7600079 76 TOROS N E 130 036 dd dn 130 03 T ical r M 4 i D l r i 760 017 i 1372 056 p i i 88 0
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